@misc{SM_1973_19_2_a0,
     title = {Ivan {Georgievich} {Petrovskii}},
     journal = {Sbornik. Mathematics},
     pages = {165},
     year = {1973},
     volume = {19},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_19_2_a0/}
}