Geodesic
Spectra of nonlinear differential equations and widths of Sobolev classes
Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 427-446

Voir la notice de l'article provenant de la source Math-Net.Ru

The authors study the problem of Kolmogorov widths of Sobolev classes $W_p^r([0,1])$ of functions in the $L_q$-metric, $p\geqslant q$, and the connected questions of the existence and uniqueness of the spectra of nonlinear equations. 
@article{SM_1992_71_2_a10,
     author = {A. P. Buslaev and V. M. Tikhomirov},
     title = {Spectra of nonlinear differential equations and widths of {Sobolev} classes},
     journal = {Sbornik. Mathematics},
     pages = {427--446},
     publisher = {mathdoc},
     volume = {71},
     number = {2},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1992_71_2_a10/}
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A. P. Buslaev; V. M. Tikhomirov. Spectra of nonlinear differential equations and widths of Sobolev classes. Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 427-446. http://geodesic.mathdoc.fr/item/SM_1992_71_2_a10/