Asymptotic Solutions of the First Boundary Value Problem for a Fourth-Order Elliptic Partial Differential Equation Robert Davis Indiana University Mathematics Journal 1956 text pdf 10.1512/iumj.1956.5.55019 10.1512/iumj.1956.5.55019 en Indiana Univ. Math. J. 5 (1956) 605 - 620 state-of-the-art mathematics http://iumj.org/access/