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@article{MV_1969_21_2_a1, author = {K. U\v{s}an}, title = {Nekotorye zamechaniya o poluklikah i opredelenie {AF-polugruppy}}, journal = {Matemati\v{c}ki vesnik}, pages = {117 }, publisher = {mathdoc}, volume = {21}, number = {2}, year = {1969}, url = {http://geodesic.mathdoc.fr/item/MV_1969_21_2_a1/} }
K. Ušan. Nekotorye zamechaniya o poluklikah i opredelenie AF-polugruppy. Matematički vesnik, Tome 21 (1969) no. 2, p. 117 . http://geodesic.mathdoc.fr/item/MV_1969_21_2_a1/