Boundary Value Problems with Bounded Nonlinearity and General Null-Space of the Linear part. Svatopluk Fucik, Miroslav Krbec (1977) Mathematische Zeitschrift
Bounded nonlinear perturbations of second order linear elliptic problems Pavel Drábek (1981) Commentationes Mathematicae Universitatis Carolinae
Bounds and critical parameters for a class of non-local problems. Al-Refai, Mohammed, Kavallaris, Nikos I. (2006) Electronic Journal of Differential Equations (EJDE) [electronic only]
Bounds for nonlinear eigenvalue problems. Benguria, Rafael D., Depassier, M.Cristina (2001) Electronic Journal of Differential Equations (EJDE) [electronic only]
Breaking of resonance and regularizing effect of a first order quasi-linear term in some elliptic equations Boumediene Abdellaoui, Ireneo Peral, Ana Primo (2008) Annales de l'I.H.P. Analyse non linéaire