@article{MMO_1974_31_a0,
     author = {P. S. Aleksandrov and A. N. Kolmogorov and O. A. Oleǐnik},
     title = {In memoriam {Ivan} {Georgievi\v{c}} {Petrovski\u{i}} {(January} 18, 1901~{\textendash} {January~15,~1973)}},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {5--16},
     year = {1974},
     volume = {31},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1974_31_a0/}
}