Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1953__3_3-4_a0, author = {Ivan, J\'an}, title = {O direktnom s\'u\v{c}ine pologr\'up}, journal = {Mathematica slovaca}, pages = {57--66}, publisher = {mathdoc}, volume = {03}, number = {3-4}, year = {1953}, mrnumber = {0062733}, language = {sl}, url = {http://geodesic.mathdoc.fr/item/MASLO_1953__3_3-4_a0/} }
Ivan, Ján. O direktnom súčine pologrúp. Mathematica slovaca, Tome 03 (1953) no. 3-4, pp. 57-66. http://geodesic.mathdoc.fr/item/MASLO_1953__3_3-4_a0/