@article{IM2_2007_71_2_a0,
     author = {E. I. Bunina and V. K. Zakharov},
     title = {Formula-inaccessible cardinals and a characterization of all natural models {of~Zermelo--Fraenkel} set theory},
     journal = {Izvestiya. Mathematics },
     pages = {219--245},
     publisher = {mathdoc},
     volume = {71},
     number = {2},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2007_71_2_a0/}
}