A One Phase Stefan Problem Avner FriedmanDavid Kinderlehrer Indiana University Mathematics Journal 1975 text pdf 10.1512/iumj.1975.24.24086 10.1512/iumj.1975.24.24086 en Indiana Univ. Math. J. 24 (1975) 1005 - 1035 state-of-the-art mathematics http://iumj.org/access/