ISBN 0245592687 books & textbook
Linear Differential Operators, Part 1: Elementary Theory of Linear Differential Operators
M. A. Naimark; Translated by E. R. Dawson; W. N. Everitt
Frederick Ungar Publishing, Co. /1968-01-01 Hardcover / 144 Pages
isbn-10: 0245592687 / isbn-13: 9780245592683
