Abstract
On etudie l'existence de solutions 2π-periodiques des equations differentielles d'ordre 3: x'''+ax″+bx'+g(t,x)=p(t,x,x',x″); x'''+ax″+bx'+φ(t,x,x'x″)x=p(t,x,x',x″); x'''+ax″+f(x)x'+g(t,x)=p(t,x,x',x″)
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