Local Behavior of Plane Gravity Flows at the Confluence of Free Boundaries and Analytic Fixed Boundaries David Carter Indiana University Mathematics Journal 1961 text pdf 10.1512/iumj.1961.10.10028 10.1512/iumj.1961.10.10028 en Indiana Univ. Math. J. 10 (1961) 441 - 449 state-of-the-art mathematics http://iumj.org/access/