@article{CMUC_1972_13_3_a9,
     author = {Lis\'a, Jarmila},
     title = {Frattinian constructions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {511--533},
     year = {1972},
     volume = {13},
     number = {3},
     mrnumber = {0316328},
     zbl = {0251.06008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1972_13_3_a9/}
}