Function-Theoretic Solutions of Certain Boundary-Value Problems V. Sreedharan Indiana University Mathematics Journal 1965 text pdf 10.1512/iumj.1965.14.14016 10.1512/iumj.1965.14.14016 en Indiana Univ. Math. J. 14 (1965) 211 - 230 state-of-the-art mathematics http://iumj.org/access/