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© 1993 The Euler International Mathematical Institute
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Buslaev, A.P., Tikhomirov, V.M. (1993). Spectral theory of nonlinear equations and n-widths of Sobolev spaces. In: Gonchar, A.A., Saff, E.B. (eds) Methods of Approximation Theory in Complex Analysis and Mathematical Physics. Lecture Notes in Mathematics, vol 1550. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0117471
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