1.
BERESTYCKI, Henri, CAPUZZO DOLCETTA, I. and NIRENBERG, Louis. Superlinear indefinite elliptic problems and nonlinear Liouville theorems. Topological Methods in Nonlinear Analysis. Online. 1 September 1994. Vol. 4, no. 1, pp. 59 - 78. [Accessed 22 July 2024].