@article{CMUC_1972_13_3_a4,
     author = {H\'ajek, Petr},
     title = {On interpretability in set theories. {II}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {445--455},
     year = {1972},
     volume = {13},
     number = {3},
     mrnumber = {0323566},
     zbl = {0251.02064},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1972_13_3_a4/}
}