1. F. Andreu, J. M. Mazon, S. Segura de Leon, and J. Toledo, “Existence and uniqueness for a degenerate parabolic equation with L 1 data,” Trans. Amer. Math. Soc., 351, No. 1, 285–306 (1999).
2. E. Di Benedetto, Degenerate Parabolic Equations, Springer, New York (1993).
3. Ph. Bénilan, L. Boccardo, T. Gallouёt, R. Gariepy, M. Pierre, and J. L. Vazquez, “An L 1-theory of existence and uniqueness of solutions of nonlinear elliptic equations,” Ann. Scuola Norm. Super. Pisa, 22, No. 2, 241–273 (1995).
4. Ph. Benilan, H. Brezis, and M. G. Crandall, “A semilinear equation in L 1,” Ann. Scuola Norm. Super. Pisa, 2, 523–555 (1975).
5. L. Boccardo, A. Dall’aglio, T. Gallouёt, and L. Orsina, “Nonlinear parabolic equations with measure data,” J. Funct. Anal., 147, 237–258 (1997).