@misc{RM_1983_38_6_a19,
     title = {Greetings to {L.\,S.~Pontryagin} on his seventieth birthday},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {142},
     publisher = {mathdoc},
     volume = {38},
     number = {6},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1983_38_6_a19/}
}