@article{RM_1978_33_6_a0,
     author = {B. Porter},
     title = {Academician {Lev} {Semyonovich} {Pontryagin}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {2--6},
     publisher = {mathdoc},
     volume = {33},
     number = {6},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1978_33_6_a0/}
}