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@article{10_21136_MB_1995_126093, author = {Zelinka, Bohdan}, title = {Subtraction semigroups}, journal = {Mathematica Bohemica}, pages = {445--447}, publisher = {mathdoc}, volume = {120}, number = {4}, year = {1995}, doi = {10.21136/MB.1995.126093}, mrnumber = {1415091}, zbl = {0851.20057}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1995.126093/} }
Zelinka, Bohdan. Subtraction semigroups. Mathematica Bohemica, Tome 120 (1995) no. 4, pp. 445-447. doi : 10.21136/MB.1995.126093. http://geodesic.mathdoc.fr/articles/10.21136/MB.1995.126093/
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