@misc{RM_1968_23_6_a6,
     title = {Lev {Semenovich} {Pontryagin} (photo)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1968},
     volume = {23},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1968_23_6_a6/}
}