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![Cover for N.A. Bobylov · Geometrical Methods in Variational Problems - Mathematics and Its Applications (Paperback Book) [Softcover reprint of the original 1st ed. 1999 edition] (2012)](https://imusic.b-cdn.net/images/item/original/558/9789401059558.jpg?n-a-bobylov-2012-geometrical-methods-in-variational-problems-mathematics-and-its-applications-paperback-book&class=scaled&v=1608940272)
![Cover for N.A. Bobylov · Geometrical Methods in Variational Problems - Mathematics and Its Applications (Hardcover Book) [1999 edition] (1999)](https://imusic.b-cdn.net/images/item/original/803/9780792357803.jpg?n-a-bobylov-1999-geometrical-methods-in-variational-problems-mathematics-and-its-applications-hardcover-book&class=scaled&v=1410154650)