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@article{PORMA_1989__46_4_115677, author = {Volenec, Vladimir}, title = {Subtractive groupoids and {TST-spaces}}, journal = {Portugaliae mathematica}, pages = {361--364}, publisher = {mathdoc}, volume = {46}, number = {4}, year = {1989}, mrnumber = {1032507}, zbl = {0686.08002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1989__46_4_115677/} }
Volenec, Vladimir. Subtractive groupoids and TST-spaces. Portugaliae mathematica, Tome 46 (1989) no. 4, pp. 361-364. http://geodesic.mathdoc.fr/item/PORMA_1989__46_4_115677/