An Exact Solution in Rotating Flow H. SathiM. Singh Indiana University Mathematics Journal 1969 text pdf 10.1512/iumj.1969.18.18020 10.1512/iumj.1969.18.18020 en Indiana Univ. Math. J. 18 (1969) 193 - 200 state-of-the-art mathematics http://iumj.org/access/