Wilcox, Calvin H. Scattering theory for the d'Alembert equation in exterior domains Calvin H. Wilcox - Berlin Springer-Verlag 1975 - 184 p. ; 25 cm. - Lecture notes in mathematics (Springer-Verlag) ; 442. . Bibliography: p. 180-184. ISBN: 038707144X Subjects--Topical Terms: Sound--waves--ScatteringWave equationLagrange equationsLaplacian operator