@article{CMUC_1978__19_2_a12,
     author = {Marek, Wiktor V. and Sochor, Anton{\'\i}n},
     title = {On a weak {Kelley-Morse} theory of classes},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {371--381},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1978},
     mrnumber = {0491176},
     zbl = {0377.02041},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1978__19_2_a12/}
}