The Simple Wave in Rotational Gas Flow Derek Naylor Indiana University Mathematics Journal 1954 text pdf 10.1512/iumj.1954.3.53021 10.1512/iumj.1954.3.53021 en Indiana Univ. Math. J. 3 (1954) 415 - 433 state-of-the-art mathematics http://iumj.org/access/