@article{RM_1981_36_1_a0,
     author = {P. S. Aleksandrov and O. A. Oleinik},
     title = {On the eightieth anniversary of the~birth of {Ivan} {Georgievich} {Petrovskii}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1981_36_1_a0/}
}