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![Cover for Johannes Elschner · Problems and Methods in Mathematical Physics: The Siegfried Proessdorf Memorial Volume Proceedings of the 11th TMP, Chemnitz (Germany), March 25-28, 1999 - Operator Theory: Advances and Applications (Pocketbok) [Softcover reprint of the original 1st ed. 2001 edition] (2012)](https://imusic.b-cdn.net/images/item/original/002/9783034895002.jpg?johannes-elschner-2012-problems-and-methods-in-mathematical-physics-the-siegfried-proessdorf-memorial-volume-proceedings-of-the-11th-tmp-chemnitz-germany-march-25-28-1999-operator-theory-advances-and-applications-pocketbok&class=scaled&v=1489003135)
![Cover for Johannes Elschner · Singular Ordinary Differential Operators and Pseudodifferential Equations - Lecture Notes in Mathematics (Pocketbok) [1985 edition] (1985)](https://imusic.b-cdn.net/images/item/original/944/9783540151944.jpg?johannes-elschner-1985-singular-ordinary-differential-operators-and-pseudodifferential-equations-lecture-notes-in-mathematics-pocketbok&class=scaled&v=1608760948)