@article{CMUC_1971__12_1_a9,
     author = {H\'ajek, Petr},
     title = {On interpretability in set theories},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {73--79},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1971},
     mrnumber = {0311470},
     zbl = {0231.02087},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1971__12_1_a9/}
}