Semigroupoid (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Semigroupoid" in English language version.

refsWebsite

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2^nd place

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1books.google.com

3^rd place

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books.google.com (Global: 3^rd place; English: 3^rd place)

See e.g. Gomes, Gracinda M. S. (2002), Semigroups, Algorithms, Automata and Languages, World Scientific, p. 41, ISBN 9789812776884, which requires the objects of a semigroupoid to form a set.

doi.org (Global: 2^nd place; English: 2^nd place)

Tilson, Bret (1987). "Categories as algebra: an essential ingredient in the theory of monoids". J. Pure Appl. Algebra. 48 (1–2): 83–198. doi:10.1016/0022-4049(87)90108-3., Appendix B