Generalizations of the Inversion Formula of Thin Airfoil Theory H. ChengN. Rott Indiana University Mathematics Journal 1954 text pdf 10.1512/iumj.1954.3.53018 10.1512/iumj.1954.3.53018 en Indiana Univ. Math. J. 3 (1954) 357 - 382 state-of-the-art mathematics http://iumj.org/access/