Leipholz H Direct variational methods and eigenvalue problems in engineering Leipholz H - Leyden Noardhoff International 1977 - viii,246p. cm. - Monographs and Text Books an Machanics of Solids and Fluids Ed by G A E Qrauas . ISBN: 90 286 0106 6 Source: General Book Subjects--Topical Terms: Equations Dewey Class. No.: B331,1:10bD, L7