@article{RM_1971_26_2_a1,
     author = {P. S. Aleksandrov and V. I. Arnol'd and I. M. Gel'fand and A. N. Kolmogorov and S. P. Novikov and O. A. Oleinik},
     title = {Ivan {Georgievich} {Petrovskii} (on his seventieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {5--28},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_2_a1/}
}