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@article{MV_1968_20_3_a17, author = {M. D. Radoj\v{c}i\'c}, title = {On the embedding of universal algebras in groupoids holding the law $XY\ast ZU\ast\ast = XZ\ast YU\ast\ast$}, journal = {Matemati\v{c}ki vesnik}, pages = {353 }, publisher = {mathdoc}, volume = {20}, number = {3}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/MV_1968_20_3_a17/} }
M. D. Radojčić. On the embedding of universal algebras in groupoids holding the law $XY\ast ZU\ast\ast = XZ\ast YU\ast\ast$. Matematički vesnik, Tome 20 (1968) no. 3, p. 353 . http://geodesic.mathdoc.fr/item/MV_1968_20_3_a17/