A Circle Theorem Related to Pure Bending of a Circular Elastically Supported Thin Plate Johann MartinekHenry Thielman Indiana University Mathematics Journal 1965 text pdf 10.1512/iumj.1965.14.14045 10.1512/iumj.1965.14.14045 en Indiana Univ. Math. J. 14 (1965) 707 - 711 state-of-the-art mathematics http://iumj.org/access/