1. Existence and multiplicity results for some nonlinear problems with singular $\phi$-Laplacian,;C. Bereanu;J. Differential Equations,2007
2. Variational methods for nonlinear perturbation of singular $\phi$-Laplacians,;C. Bereanu;Rend. Lincei Mat. Appl.,2011
3. Existence of at least two periodic solutions of the forced relativistic pendulum,;C. Bereanu;Proc. Amer. Math. Soc.,2012
4. Periodic solutions of the forced relativistic pendulum,;H. Brezis;Differential Integral Equations,2010
5. Periodic solutions of Lagrangian systems of relativistic oscillators,;H. Brezis;Comm. Appl. Anal.,2011