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@article{MASLO_1972__22_1_a4, author = {Lihov\'a, Judita}, title = {The {Lattice} of all {Systems} of $r${-Ideals} in a {Set}}, journal = {Mathematica slovaca}, pages = {50--58}, publisher = {mathdoc}, volume = {22}, number = {1}, year = {1972}, mrnumber = {0302520}, zbl = {0232.54002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1972__22_1_a4/} }
Lihová, Judita. The Lattice of all Systems of $r$-Ideals in a Set. Mathematica slovaca, Tome 22 (1972) no. 1, pp. 50-58. http://geodesic.mathdoc.fr/item/MASLO_1972__22_1_a4/