[2] Baiocchi C.: 
Soluzioni deboli dei problemi ai limiti per le equazioni paraboliche del tipo del calore. Ist. Lombardo Accad. Sci. Lett. Rend. Sez. A 103 (1969), 704-726. 
MR 0262696[3] Bonafede S.: 
On maximum principle for weak subsolutions of degenerate parabolic linear equations. Comment. Math. Univ. Carolin. 35 (1994), 417-430. 
MR 1307270 | 
Zbl 0808.35065[4] Bonafede S.: 
A generalized maximum principle for weak subsolutions of degenerate parabolic equations. Rend. Circ. Mat. Palermo (2) 41 (1992), 81-95. 
MR 1175590[5] Drábek P., Nicolosi F.: 
Existence of bounded solutions for some degenerated quasilinear elliptic equations. Ann. Mat. Pura Appl. (4) 165 (1993), 217-238. 
MR 1271420[7] Guglielmino F., Nicolosi F.: 
W-solutions of boundary value problems for degenerate elliptic operators. Ricerche Mat. Suppl. 36 (1987), 59-72. 
MR 0956018[8] Guglielmino F., Nicolosi F.: 
Existence theorems for boundary value problems associated with quasilinear elliptic equations. Ricerche Mat. 37 (1988), 157-176. 
MR 1021963[9] Guglielmino F., Nicolosi F.: Existence results for boundary value problems for a class of quasilinear parabolic equations. Actual problems in analysis and mathematical physics, Proceeding of the international symposium in Taormina, Italy, 1992. Univ. di Roma, Roma, 1993, pp. 95-117.
[10] Ladyzhenskaja O. A., Solonnikov V. A., Ural'tseva N. N.: Linear and Quasi-Linear Equations of Parabolic Type. Translation of mathematical monographs, vol. 23, A. M. S. Providence, 1968.
[12] Nicolosi F.: 
Sottosoluzioni deboli delle equazioni paraboliche lineari del secondo ordine superiormente limitate. Matematiche 28 (1973), 361-378. 
MR 0364867[13] Nicolosi F.: 
Soluzioni dei problemi al contorno per operatori parabolici che possono degenerare. Ann. Mat. Pura Appl., IV. Ser. 125 (1980), 135-155. 
MR 1553443[14] Platone Garroni M. G.: 
A generalized maximum principle for boundary value problems for elliptic operators with discontinuous coefficients. Boll. U.M.I. (4) 9 (1974), 1-9. 
MR 0372415 | 
Zbl 0294.35025[15] Protter M. H., Weinberger H. F.: 
Regular points for elliptic equations with discontinuous coefficients. Ann. Scuola Sup. Pisa 17 (1963), 45-79. 
MR 0161019[16] Stampacchia G.: 
Le probleme de Dirichiet pour les equations elliptiques du second ordre a coefficients discontinus. Annal. Inst. Fourier 15 (1965), 187-257. 
MR 0192177