@article{AL_1991_30_6_a3,
     author = {A. S. Nudel'man},
     title = {On the metatheory of sets},
     journal = {Algebra i logika},
     pages = {671--692},
     year = {1991},
     volume = {30},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1991_30_6_a3/}
}