1. Existence d'ondes solitaires dans les problèmes non-linéaires du type Klein-Gordon;Berestycki;C. R. Acad. Sci. Paris Sér. A Math.,1978
2. Existence of a ground state in nonlinear equations of the type Klein–Gordon;Berestycki,1980
3. Nonlinear scalar field equations I;Berestycki;Arch. Rational Mech. Anal.,1983
4. Nonlinear scalar field equations II;Berestycki;Arch. Rational Mech. Anal.,1983
5. An ODE approach to the existence of positive solutions for semilinear problems in RN;Berestycki;Indiana Univ. Math. J.,1981