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Reference
Z. Hedrlín and J. Lambek: How comprehensive is the category of semigroups?, J. Algebra 11 (1969), 195–212.
V. Koubek and J. Sichler: Universal varieties of semigroups, J. Austral. Math. Soc. (Series A) 36 (1984), 143–152.
A. Pultr and V. Trnková: Combinatorial, algebraic and topological representations of groups, semigroups and categories, North Holland, Amsterdam, 1980.
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© 1988 Springer-Verlag
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Goralčik, P., Koubek, V. (1988). On universality of extensions. In: Jürgensen, H., Lallement, G., Weinert, H.J. (eds) Semigroups Theory and Applications. Lecture Notes in Mathematics, vol 1320. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0083427
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DOI: https://doi.org/10.1007/BFb0083427
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Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-19347-0
Online ISBN: 978-3-540-39225-5
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