1. A. Alvino, Sulla disuguaglianza di Sobolev in Spazi di Lorentz, Boll. Un. Mat. It. A (5), 14 (1977), 148–156.
2. H. W. Alt, S. Luckhaus, Quasi-linear elliptic-parabolic differential equations, Math. Z., 183 (1983), 311–341. http://doi.org/10.1007/BF01176474
3. A. Bensoussan, J. Lions, Applications of variational inequalities in stochastic control, Amsterdam-New York: North-Holland Publishing, 1982.
4. V. Bögelein, F. Duzaar, G. Mingione, Degenerate problems with irregular obstacles, J. Reine Angew. Math., 650 (2011), 107–160. https://doi.org/10.1515/crelle.2011.006
5. H. Brézis, Problémes unilatéraux, J. Math. Pures Appl. (9), 51 (1972), 1–168.