A free boundary problem associated with crystallization of polymers in a temperature field Avner FriedmanJuan Velazquez 35R3549J40crystallizationpolymersfree boundarypotential theory Indiana University Mathematics Journal 2001 text pdf 10.1512/iumj.2001.50.2118 10.1512/iumj.2001.50.2118 en Indiana Univ. Math. J. 50 (2001) 1609 - 1650 state-of-the-art mathematics http://iumj.org/access/