[1] Friedman A, Bei Hu. A Stefan problem for a protocell model. SIAM J Math Anal, 1998, 30: 912-926

[2] Schwegler H, Tarumi K, Gerstmann B. Physico-chemical model of protocell. J Math Biology, 1995, 22:
335-348

[3] Tarumi K, Schwegler H. A nonlinear treatment of the protocell by boundary layer approximation. Bull
Math Biology, 1987, 49: 307-320

[4] Kinderlrhrer D, Nirenberg L. The smoothness of the boundary in the one phase Stefan problem. Comm
Pure Appl Math, 1978, 31: 257-282

[5] Caffarelli L A. The smoothness of the free surface in a filtraction problem. Arch Rational Mech Anal,
1976,63: 77-86

[6] Caffarelli L A. The regularity of the elliptic and parabolic free boundaries. Bull AMS, 1976, 82: 616-618

[7] Caffarelli L A. The regularity of the boundaries in higher dimensions. Acta Math, 1977, 139: 155-184

[8] Hanzawa E I. Classical solution of the Stefan problem. Tohoku Math J, 1981, 33: 297-335

[9] Radkevich E V, Melikulov A S. Boundary value problem with free boundary. Fan Tashkent, 1998 (Russian)

[10] Bazaly B V, Degtyarev S P. On classical solvability of the multidimensional Stefan problem for convective
motion of a viscous incompressible fluid. Math USSR Sb, 1988, 60: 1-17

[11] Rodrigues J F, Solonnikov V A, Yi F. On a parabolic system with time derivative in the boundary
conditions and related free boundary problems. Math Ann, 1999, 315: 61-95

[12] Wang Xiaohua. Regularity of elliptic equation in time direction. Journal of China Normal Univer-
sity(Natural Science Edition), 2002, 95: 19-23

[13] Ladyzenskaia O A, Solonnikov V A, Ural’ceva N N. Linear and quasilinear equations of parabolic type.
American Mathematical Society, 1968