DeSanto, J. A. Scalar wave theory : Green's functions and applications / J.A. DeSanto. - Berlin : Springer-Verlag, c1992. - xiii, 193 p. - Springer series on wave phenomena . - Felsen, L. B. . ISBN: 3540552634 LCCN: 93016236 Subjects--Topical Terms: Wave equation.Wave equation--Numerical solutions.Green's functions.