TY  - JOUR
AU  - A. P. Buslaev
AU  - V. M. Tikhomirov
TI  - Spectra of nonlinear differential equations and widths of Sobolev classes
JO  - Sbornik. Mathematics
PY  - 1992
SP  - 427
EP  - 446
VL  - 71
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1992_71_2_a10/
LA  - en
ID  - SM_1992_71_2_a10
ER  -