Media type: E-Article Title: Self-adjoint sums of operators and the theory of nonlinear wave equations Contributor: Bazley, N. W.; Strack, K. G. Published: Informa UK Limited, 1982 Published in: Applicable Analysis, 13 (1982) 1, Seite 45-52 Language: English DOI: 10.1080/00036818208839374 ISSN: 0003-6811; 1563-504X Keywords: Applied Mathematics ; Analysis Origination: Footnote: