TY - BOOK AU - Weidmann,Joachim TI - Spectral theory of ordinary differential operators T2 - Lecture notes in mathematics SN - 038717902X PY - 1987/// CY - Berlin , New York PB - Springer-Verlag KW - Differential operators KW - Spectral theory (Mathematics) N1 - Includes index; Bibliography: p. [295]-300 ER -