@article{AUPO_1972_12_1_a9,
     author = {\v{Z}idek, Stanislav},
     title = {Pseudoringe},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {67--75},
     year = {1972},
     volume = {12},
     number = {1},
     mrnumber = {0349770},
     zbl = {0387.16019},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1972_12_1_a9/}
}