Rotational Stagnation-Point Flow R. BogerG. Ludford Indiana University Mathematics Journal 1967 text pdf 10.1512/iumj.1967.16.16086 10.1512/iumj.1967.16.16086 en Indiana Univ. Math. J. 16 (1967) 1339 - 1359 state-of-the-art mathematics http://iumj.org/access/