TY - BOOK AU - Naimark,M.A. AU - Dawson,E.R. AU - Everitt,W.N. TI - Linear differential operators part I : elementary theory of linear differential operators ; with additional material by the author / U1 - 515.354 PY - 1967/// CY - New York PB - Frederick Ungar, KW - Mathematics KW - Linear differentiation KW - Differential equations ER -