NYSTRÖM, K. Regularity below the continuous threshold in a two-phase parabolic free boundary problem. MATHEMATICA SCANDINAVICA, [S. l.], v. 99, n. 2, p. 257–286, 2006. DOI: 10.7146/math.scand.a-15012. Disponível em: https://www.mscand.dk/article/view/15012. Acesso em: 3 may. 2024.