Parameter dependence of solutions of classes of quasi-linear elliptic and parabolic differential equations -- Some applications of the method of super and subsolutions -- Multiple solutions of a bifurcation problem -- On nonlinear eigenvalue problems which extend into free boundaries problems -- aux theories statistiques de la turbulence pleinement developpee -- Experimental study of the mechanism of a new hydrodynamical instability observed at some interfaces between immiscible liquids -- Remarques sur un problème de valeurs propres non linéaires faisant intervenir des fonctions non différentiables -- Solar flares: A non linear eigenvalue problem in an unbounded domain -- Bifurcation of invariant tori in R3 -- Pattern formation and wave propagation in the s-a system -- Variation d'un point de retournement par rapport au domaine -- Dynamic Pade' approximant and behavior singularities in nonlinear physico-chemical systems -- Remarks on a non linear equation arising in population genetics -- Triplets de solutions d'une equation aux derivees partielles elliptique non lineaire.