Spectral Theory of Canonical Differential Systems. Method of Operator Identities By Lev A. Sakhnovich (auth.) 1999 | 202 Pages | ISBN: 3034897391 | PDF | 15 MB
Bitangential Direct and Inverse Problems for Systems of Integral and Differential Equations by Damir Z. Arov, Harry Dym English | ISBN: 1107018870 | 2012 | PDF | 488 pages | 4,5 MB
A (Terse) Introduction to Linear Algebra (Student Mathematical Library) by Yitzhak Katznelson and Yonatan R. Katznelson English | 2008 | ISBN: 0821844199 | 215 Pages | DJVU | 1.89 MB