@article{CMUC_1968__9_4_a3,
     author = {Je\v{z}ek, Jaroslav},
     title = {Principal dual ideals in lattices of primitive classes},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {533--545},
     publisher = {mathdoc},
     volume = {09},
     number = {4},
     year = {1968},
     mrnumber = {0244131},
     zbl = {0172.30902},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1968__9_4_a3/}
}