Hadsell, Frank, 1929-Diaz Navarro, Ricardo2021-01-122022-02-032021-01-122022-02-031971https://hdl.handle.net/11124/175650Includes bibliographical references.masters thesesengCopyright of the original work is retained by the author.Wave-motion, Theory ofWaves -- MathematicsVariational method in wave propagation problemsText