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@article{MV_1975_27_1_a32, author = {H. Lal}, title = {Quasi-commutative primary semigroups}, journal = {Matemati\v{c}ki vesnik}, pages = {271 }, publisher = {mathdoc}, volume = {27}, number = {1}, year = {1975}, url = {http://geodesic.mathdoc.fr/item/MV_1975_27_1_a32/} }
H. Lal. Quasi-commutative primary semigroups. Matematički vesnik, Tome 27 (1975) no. 1, p. 271 . http://geodesic.mathdoc.fr/item/MV_1975_27_1_a32/