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![Cover for N N Janenko · Die Zwischenschrittmethode Zur Losung Mehrdimensionaler Probleme Der Mathematischen Physik - Lecture Notes in Mathematics (Paperback Book) [German, 1969 edition] (1969)](https://imusic.b-cdn.net/images/item/original/103/9783540046103.jpg?n-n-janenko-1969-die-zwischenschrittmethode-zur-losung-mehrdimensionaler-probleme-der-mathematischen-physik-lecture-notes-in-mathematics-paperback-book&class=scaled&v=1608836714)