2.
Problemas De Ecuaciones Diferenciales Ordinarias / Ordinary Differential Equations Problems ...
by M. L. Krasnov, G. Makerenko
ISBN: 9788480410151
List Price: $19.95
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Problems and Exercises in the Calculus of Variations
by Krasnov, M. L.
ISBN: 9780828527866
List Price: $7.95