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@article{MASLO_1987__37_1_a7, author = {Balcerzak, Marek}, title = {Classification of $sigma$-ideals}, journal = {Mathematica slovaca}, pages = {63--70}, publisher = {mathdoc}, volume = {37}, number = {1}, year = {1987}, mrnumber = {899018}, zbl = {0611.28001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1987__37_1_a7/} }
Balcerzak, Marek. Classification of $sigma$-ideals. Mathematica slovaca, Tome 37 (1987) no. 1, pp. 63-70. http://geodesic.mathdoc.fr/item/MASLO_1987__37_1_a7/