TY - JOUR AU - John Andersson AU - Erik Lindgren AU - Henrik Shahgholian TI - Optimal regularity for the parabolic no-sign obstacle type problem JO - Interfaces and free boundaries PY - 2013 SP - 477 EP - 499 VL - 15 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4171/ifb/311/ DO - 10.4171/ifb/311 ID - 10_4171_ifb_311 ER -