@article{DE_1972_8_11_a7,
     author = {A. A. Levakov and \`E. S. Shpigelman},
     title = {The boundedness of infinitely continuable solutions of a system of two equations with quadratic right hand sides, and the set of characteristic {Ljapunov} exponents of the solutions of this system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1969--1976},
     publisher = {mathdoc},
     volume = {8},
     number = {11},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_11_a7/}
}