International Journal of Mathematics and Mathematical Sciences 
Volume 10 (1987), Issue 4, Pages 825-827
doi:10.1155/S0161171287000929

An inverse problem for Helmholtz's equation

A. G. Ramm

 Mathematics Department, Kansas State University, Manhattan 66506, KS, USA
Received 20 March 1987

Abstract

The refraction coefficient in Helmholtz's equation is found from the knowledge of a family of the solutions to this equation on two lines.