Semigroup Forum

Semigroup Forum is a platform for speedy and efficient transmission of information on current research in semigroup theory. Scope: Algebraic semigroups, topological semigroups, partially ordered semigroups, semigroups of measures and harmonic analysis on semigroups, numerical semigroups, transformation semigroups, semigroups of operators, and applications of semigroup theory to other disciplines such as ring theory, category theory, automata, logic, etc. Languages: English (preferred), French, German, Russian. Survey Articles: Expository, such as a symposium lecture. Of any length. May include original work, but should present the nonspecialist with a reasonably elementary and self-contained account of the fundamental parts of the subject. Research Articles: Will be subject to the usual refereeing procedure. Research Announcements: Description, limited to eight pages, of new results, mostly without proofs, of full length papers appearing elsewhere. The announcement must be accompanied by a copy of the unabridged version. Short Notes: (Maximum 4 pages) Worthy of the readers' attention, such as new proofs, significant generalizations of known facts, comments on unsolved problems, historical remarks, etc. Research Problems: Unsolved research problems. Announcements: Of conferences, seminars, and symposia on Semigroup Theory. Abstracts and Bibliographical Items: Abstracts in English, limited to one page, of completed work are solicited. Listings of books, papers, and lecture notes previously published elsewhere and, above all, of new papers for which preprints are available are solicited from all authors. Abstracts for Reviewing Journals: Authors are invited to provide with their manuscript informally a one-page abstract of their contribution with key words and phrases and with subject matter classification. This material will be forwarded to Zentralblatt für Mathematik.

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Category	Year	Quartile
Algebra and Number Theory	1999	Q3
Algebra and Number Theory	2000	Q3
Algebra and Number Theory	2001	Q3
Algebra and Number Theory	2002	Q4
Algebra and Number Theory	2003	Q3
Algebra and Number Theory	2004	Q2
Algebra and Number Theory	2005	Q2
Algebra and Number Theory	2006	Q2
Algebra and Number Theory	2007	Q3
Algebra and Number Theory	2008	Q2
Algebra and Number Theory	2009	Q2
Algebra and Number Theory	2010	Q2
Algebra and Number Theory	2011	Q1
Algebra and Number Theory	2012	Q2
Algebra and Number Theory	2013	Q3
Algebra and Number Theory	2014	Q3
Algebra and Number Theory	2015	Q1
Algebra and Number Theory	2016	Q2
Algebra and Number Theory	2017	Q1
Algebra and Number Theory	2018	Q2
Algebra and Number Theory	2019	Q2
Algebra and Number Theory	2020	Q3
Algebra and Number Theory	2021	Q2
Algebra and Number Theory	2022	Q2
Algebra and Number Theory	2023	Q1

SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Year	SJR
1999	0.698
2000	0.574
2001	0.396
2002	0.265
2003	0.604
2004	0.872
2005	0.773
2006	0.881
2007	0.650
2008	0.742
2009	0.855
2010	0.774
2011	1.131
2012	0.723
2013	0.554
2014	0.507
2015	0.994
2016	0.785
2017	0.917
2018	0.562
2019	0.581
2020	0.520
2021	0.609
2022	0.715
2023	0.735

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Year	Documents
1999	71
2000	72
2001	64
2002	57
2003	62
2004	70
2005	63
2006	77
2007	76
2008	70
2009	88
2010	70
2011	78
2012	77
2013	86
2014	93
2015	99
2016	77
2017	91
2018	59
2019	84
2020	95
2021	94
2022	86
2023	75

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per document	Year	Value
Cites / Doc. (4 years)	1999	0.351
Cites / Doc. (4 years)	2000	0.302
Cites / Doc. (4 years)	2001	0.241
Cites / Doc. (4 years)	2002	0.277
Cites / Doc. (4 years)	2003	0.265
Cites / Doc. (4 years)	2004	0.427
Cites / Doc. (4 years)	2005	0.415
Cites / Doc. (4 years)	2006	0.440
Cites / Doc. (4 years)	2007	0.430
Cites / Doc. (4 years)	2008	0.500
Cites / Doc. (4 years)	2009	0.657
Cites / Doc. (4 years)	2010	0.582
Cites / Doc. (4 years)	2011	0.816
Cites / Doc. (4 years)	2012	0.670
Cites / Doc. (4 years)	2013	0.626
Cites / Doc. (4 years)	2014	0.508
Cites / Doc. (4 years)	2015	0.659
Cites / Doc. (4 years)	2016	0.558
Cites / Doc. (4 years)	2017	0.586
Cites / Doc. (4 years)	2018	0.561
Cites / Doc. (4 years)	2019	0.610
Cites / Doc. (4 years)	2020	0.698
Cites / Doc. (4 years)	2021	0.617
Cites / Doc. (4 years)	2022	0.702
Cites / Doc. (4 years)	2023	0.774
Cites / Doc. (3 years)	1999	0.351
Cites / Doc. (3 years)	2000	0.249
Cites / Doc. (3 years)	2001	0.232
Cites / Doc. (3 years)	2002	0.217
Cites / Doc. (3 years)	2003	0.254
Cites / Doc. (3 years)	2004	0.475
Cites / Doc. (3 years)	2005	0.434
Cites / Doc. (3 years)	2006	0.441
Cites / Doc. (3 years)	2007	0.410
Cites / Doc. (3 years)	2008	0.509
Cites / Doc. (3 years)	2009	0.614
Cites / Doc. (3 years)	2010	0.632
Cites / Doc. (3 years)	2011	0.825
Cites / Doc. (3 years)	2012	0.589
Cites / Doc. (3 years)	2013	0.507
Cites / Doc. (3 years)	2014	0.432
Cites / Doc. (3 years)	2015	0.668
Cites / Doc. (3 years)	2016	0.586
Cites / Doc. (3 years)	2017	0.576
Cites / Doc. (3 years)	2018	0.532
Cites / Doc. (3 years)	2019	0.678
Cites / Doc. (3 years)	2020	0.654
Cites / Doc. (3 years)	2021	0.664
Cites / Doc. (3 years)	2022	0.744
Cites / Doc. (3 years)	2023	0.800
Cites / Doc. (2 years)	1999	0.282
Cites / Doc. (2 years)	2000	0.215
Cites / Doc. (2 years)	2001	0.161
Cites / Doc. (2 years)	2002	0.184
Cites / Doc. (2 years)	2003	0.240
Cites / Doc. (2 years)	2004	0.445
Cites / Doc. (2 years)	2005	0.364
Cites / Doc. (2 years)	2006	0.383
Cites / Doc. (2 years)	2007	0.343
Cites / Doc. (2 years)	2008	0.471
Cites / Doc. (2 years)	2009	0.575
Cites / Doc. (2 years)	2010	0.627
Cites / Doc. (2 years)	2011	0.816
Cites / Doc. (2 years)	2012	0.493
Cites / Doc. (2 years)	2013	0.387
Cites / Doc. (2 years)	2014	0.374
Cites / Doc. (2 years)	2015	0.682
Cites / Doc. (2 years)	2016	0.484
Cites / Doc. (2 years)	2017	0.494
Cites / Doc. (2 years)	2018	0.530
Cites / Doc. (2 years)	2019	0.493
Cites / Doc. (2 years)	2020	0.713
Cites / Doc. (2 years)	2021	0.665
Cites / Doc. (2 years)	2022	0.741
Cites / Doc. (2 years)	2023	0.778

Total Cites

Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Cites	Year	Value
Self Cites	1999	8
Self Cites	2000	14
Self Cites	2001	11
Self Cites	2002	9
Self Cites	2003	10
Self Cites	2004	23
Self Cites	2005	12
Self Cites	2006	19
Self Cites	2007	22
Self Cites	2008	15
Self Cites	2009	18
Self Cites	2010	17
Self Cites	2011	30
Self Cites	2012	21
Self Cites	2013	25
Self Cites	2014	27
Self Cites	2015	34
Self Cites	2016	35
Self Cites	2017	21
Self Cites	2018	14
Self Cites	2019	17
Self Cites	2020	21
Self Cites	2021	28
Self Cites	2022	32
Self Cites	2023	43
Total Cites	1999	47
Total Cites	2000	45
Total Cites	2001	48
Total Cites	2002	45
Total Cites	2003	49
Total Cites	2004	87
Total Cites	2005	82
Total Cites	2006	86
Total Cites	2007	86
Total Cites	2008	110
Total Cites	2009	137
Total Cites	2010	148
Total Cites	2011	188
Total Cites	2012	139
Total Cites	2013	114
Total Cites	2014	104
Total Cites	2015	171
Total Cites	2016	163
Total Cites	2017	155
Total Cites	2018	142
Total Cites	2019	154
Total Cites	2020	153
Total Cites	2021	158
Total Cites	2022	203
Total Cites	2023	220

External Cites per Doc

Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

Cites	Year	Value
External Cites per document	1999	0.291
External Cites per document	2000	0.171
External Cites per document	2001	0.179
External Cites per document	2002	0.174
External Cites per document	2003	0.202
External Cites per document	2004	0.350
External Cites per document	2005	0.370
External Cites per document	2006	0.344
External Cites per document	2007	0.305
External Cites per document	2008	0.440
External Cites per document	2009	0.534
External Cites per document	2010	0.560
External Cites per document	2011	0.693
External Cites per document	2012	0.500
External Cites per document	2013	0.396
External Cites per document	2014	0.320
External Cites per document	2015	0.535
External Cites per document	2016	0.460
External Cites per document	2017	0.498
External Cites per document	2018	0.479
External Cites per document	2019	0.604
External Cites per document	2020	0.564
External Cites per document	2021	0.546
External Cites per document	2022	0.626
External Cites per document	2023	0.644
Cites per document	1999	0.351
Cites per document	2000	0.249
Cites per document	2001	0.232
Cites per document	2002	0.217
Cites per document	2003	0.254
Cites per document	2004	0.475
Cites per document	2005	0.434
Cites per document	2006	0.441
Cites per document	2007	0.410
Cites per document	2008	0.509
Cites per document	2009	0.614
Cites per document	2010	0.632
Cites per document	2011	0.825
Cites per document	2012	0.589
Cites per document	2013	0.507
Cites per document	2014	0.432
Cites per document	2015	0.668
Cites per document	2016	0.586
Cites per document	2017	0.576
Cites per document	2018	0.532
Cites per document	2019	0.678
Cites per document	2020	0.654
Cites per document	2021	0.664
Cites per document	2022	0.744
Cites per document	2023	0.800

% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

Year	International Collaboration
1999	15.49
2000	6.94
2001	23.44
2002	21.05
2003	19.35
2004	22.86
2005	23.81
2006	16.88
2007	22.37
2008	34.29
2009	25.00
2010	24.29
2011	21.79
2012	15.58
2013	18.60
2014	41.94
2015	20.20
2016	32.47
2017	27.47
2018	30.51
2019	21.43
2020	21.05
2021	30.85
2022	11.63
2023	20.00

Citable documents

Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Documents	Year	Value
Non-citable documents	1999	0
Non-citable documents	2000	0
Non-citable documents	2001	0
Non-citable documents	2002	0
Non-citable documents	2003	0
Non-citable documents	2004	0
Non-citable documents	2005	0
Non-citable documents	2006	0
Non-citable documents	2007	0
Non-citable documents	2008	0
Non-citable documents	2009	0
Non-citable documents	2010	0
Non-citable documents	2011	0
Non-citable documents	2012	3
Non-citable documents	2013	4
Non-citable documents	2014	4
Non-citable documents	2015	2
Non-citable documents	2016	1
Non-citable documents	2017	1
Non-citable documents	2018	1
Non-citable documents	2019	1
Non-citable documents	2020	2
Non-citable documents	2021	4
Non-citable documents	2022	4
Non-citable documents	2023	4
Citable documents	1999	134
Citable documents	2000	181
Citable documents	2001	207
Citable documents	2002	207
Citable documents	2003	193
Citable documents	2004	183
Citable documents	2005	189
Citable documents	2006	195
Citable documents	2007	210
Citable documents	2008	216
Citable documents	2009	223
Citable documents	2010	234
Citable documents	2011	228
Citable documents	2012	233
Citable documents	2013	221
Citable documents	2014	237
Citable documents	2015	254
Citable documents	2016	277
Citable documents	2017	268
Citable documents	2018	266
Citable documents	2019	226
Citable documents	2020	232
Citable documents	2021	234
Citable documents	2022	269
Citable documents	2023	271

Cited documents

Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Documents	Year	Value
Uncited documents	1999	109
Uncited documents	2000	145
Uncited documents	2001	173
Uncited documents	2002	171
Uncited documents	2003	151
Uncited documents	2004	123
Uncited documents	2005	138
Uncited documents	2006	144
Uncited documents	2007	153
Uncited documents	2008	150
Uncited documents	2009	143
Uncited documents	2010	149
Uncited documents	2011	147
Uncited documents	2012	156
Uncited documents	2013	149
Uncited documents	2014	163
Uncited documents	2015	152
Uncited documents	2016	178
Uncited documents	2017	182
Uncited documents	2018	173
Uncited documents	2019	146
Uncited documents	2020	149
Uncited documents	2021	138
Uncited documents	2022	159
Uncited documents	2023	153
Cited documents	1999	25
Cited documents	2000	36
Cited documents	2001	34
Cited documents	2002	36
Cited documents	2003	42
Cited documents	2004	60
Cited documents	2005	51
Cited documents	2006	51
Cited documents	2007	57
Cited documents	2008	66
Cited documents	2009	80
Cited documents	2010	85
Cited documents	2011	81
Cited documents	2012	80
Cited documents	2013	76
Cited documents	2014	78
Cited documents	2015	104
Cited documents	2016	100
Cited documents	2017	87
Cited documents	2018	94
Cited documents	2019	81
Cited documents	2020	85
Cited documents	2021	100
Cited documents	2022	114
Cited documents	2023	122

% Female Authors

Evolution of the percentage of female authors.

Year	Female Percent
1999	18.99
2000	16.28
2001	19.78
2002	17.39
2003	15.19
2004	18.60
2005	24.47
2006	20.54
2007	24.53
2008	20.56
2009	25.37
2010	20.63
2011	21.50
2012	17.24
2013	17.05
2014	19.64
2015	28.21
2016	25.71
2017	20.73
2018	18.95
2019	21.57
2020	24.57
2021	19.75
2022	24.24
2023	27.13

Documents cited by public policy (Overton)

Evolution of the number of documents cited by public policy documents according to Overton database.

Documents	Year	Value
Overton	1999	0
Overton	2000	0
Overton	2001	0
Overton	2002	1
Overton	2003	0
Overton	2004	0
Overton	2005	0
Overton	2006	1
Overton	2007	0
Overton	2008	0
Overton	2009	0
Overton	2010	0
Overton	2011	0
Overton	2012	0
Overton	2013	0
Overton	2014	0
Overton	2015	0
Overton	2016	0
Overton	2017	0
Overton	2018	0
Overton	2019	0
Overton	2020	0
Overton	2021	0
Overton	2022	0
Overton	2023	0