@article{MASLO_1987__37_4_a10,
     author = {Duda, Jarom{\'\i}r},
     title = {Unified polynomials for congruence principality},
     journal = {Mathematica slovaca},
     pages = {407--416},
     publisher = {mathdoc},
     volume = {37},
     number = {4},
     year = {1987},
     mrnumber = {916949},
     zbl = {0641.08008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1987__37_4_a10/}
}