1. J. Bailly, “Local existence of classical solutions to first-order parabolic equations describing free boundaries,” University de Paris-Sud Mathematiques Batiment 425 91405 ORSAY, France (1996).
2. J. Bear, Dynamics of Fluids in Porous Media, American Elsevier, New York (1972).
3. M. S. Berger and L. E. Fraenkel, “On the asymptotic solution of a nonlinear Dirichlet problem,” J. Math. Mech., 19, 553–585 (1970).
4. A. Bonami, D. Hilhorst, E. Logak, and M. Mimura, “A free boundary problem arising in a chemotaxis model,” In: M. Niezgodka and P. Sitzlecki, Eds., Free Boundary Problems, Theory and Applications, Longman (1996).
5. G. Caginalp, “An analysis of a phase field model of a free boundary,” Arch. Mech. Anal., 92, 205–245 (1986).