Nonlinear problems in theoretical physics : proceedings of the IX G.I.F.T. International Seminar on Theoretical Physics, held at Jaca, Huesca (Spain), June 1978 / edited by A. F. Rañada. International Seminar on Theoretical Physics, 9th, Jaca, Spain, 1978. Rañada, A. F., 1939- Grupo Interuniversitario de Física Teórica. Nonlinear theories Congresses. Mathematical physics Congresses. QC20.7.N6 I55 1978 530 RAN Includes bibliographical references and index. Berlin ; New York : Springer-Verlag, 1979. 1979. 1979 Text x, 216 p. : eng Lecture notes in physics ; 98