@article{DAN_1960_132_6_a4,
     author = {M. I. Vishik and L. A. Lyusternik},
     title = {Initial jump for nonlinear differential equations containing a small parameter},
     journal = {Doklady Akademii Nauk},
     pages = {1242--1245},
     publisher = {mathdoc},
     volume = {132},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_132_6_a4/}
}