1. Albasiny, E. L., ?The solution of nonlinear heat conduction problems by the pilot ACE?,Proc. Inst. Elec. Engrs, B1 (1956) 158?162.
2. Alt, H. W., ?The fluid flow through porous media. Regularity of the free surface?,Manuscripra Math.,21 (1977) 255?272.
3. Baiocchi, C., ?Su un problema di frontiera libera connesso a questioni di idraulica?,Ann. Mat. Pura Appl.,92 (1972) 107?127.
4. Baiocchi, C. and Capelo, A.,Variational and Quasivariational Inequalities. Applications to Free Boundary Problems, Interscience, New York, 1984.
5. Bazaliy, B. V. and Degtyarev, S. P., ?The classical solution of the nonstationary Stefan problem with convection?,Dokl. Acad. Nauk USSR,287(1) (1986) 20?24.