We study the existence and uniqueness of the positive solutions of the problem (P):We construct a maximal solution, prove that this maximal solution is a large solution whenever q < N/(N − 2) and it is unique if ∂Ω = ∂Ω c . If ∂Ω has the local graph property, we prove that there exists at most one solution to problem (P).1991 Mathematics Subject Classification. 35K60, 34.