The Green's Function for Periodic Structures in Diffraction Theory with an Application to Parallel Plate Media, II Albert Heins Indiana University Mathematics Journal 1957 text pdf 10.1512/iumj.1957.6.56033 10.1512/iumj.1957.6.56033 en Indiana Univ. Math. J. 6 (1957) 629 - 639 state-of-the-art mathematics http://iumj.org/access/