@article{AA_1991_3_6_a3,
     author = {A. P. Buslaev},
     title = {On the asymptotics of widths and of spectra of nonlinear differential equations},
     journal = {Algebra i analiz},
     pages = {108--118},
     publisher = {mathdoc},
     volume = {3},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1991_3_6_a3/}
}