Local Behavior of Plane Gravity Flows II. Infinite Jets on Fixed Boundaries David Carter Indiana University Mathematics Journal 1964 text pdf 10.1512/iumj.1964.13.13021 10.1512/iumj.1964.13.13021 en Indiana Univ. Math. J. 13 (1964) 329 - 351 state-of-the-art mathematics http://iumj.org/access/