Linear differential operators : Pt. 2, linear differential operatorsin hilbert space / M.A. Naimark ; translated by E.R. Dawson ; English translation edited by W.N. Everitt. Lineinye differentsialnye operatory / English Elementary theory of linear differential operators. Linear differential operators in Hilbert space. Naimark, M. A. (Mark Aronovich) Dawson, E. R. tr. Differential equations, Linear. Differential operators. QA372 .N21321968 517.382 NAL Includes bibliographical references and indexes. London ; Toronto : Harrap, c1968. c1968. 1968 Text xv, 352 : eng eng rus