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@article{SF_1971__2_133816, author = {O. Steinfeld}, title = {An analogue of {Litoff's} {Theorem.}}, journal = {Semigroup forum}, pages = {86--88}, publisher = {mathdoc}, volume = {2}, year = {1971}, zbl = {0238.20084}, url = {https://geodesic-test.mathdoc.fr/item/SF_1971__2_133816/} }
O. Steinfeld. An analogue of Litoff's Theorem.. Semigroup forum, Tome 2 (1971), pp. 86-88. https://geodesic-test.mathdoc.fr/item/SF_1971__2_133816/