On the Continuity of the Solid and Fluid States Walter Noll Indiana University Mathematics Journal 1955 text pdf 10.1512/iumj.1955.4.54001 10.1512/iumj.1955.4.54001 en Indiana Univ. Math. J. 4 (1955) 3 - 81 state-of-the-art mathematics http://iumj.org/access/