The non-homogeneous Vekua equation. (L'équation non-homogène de Vekua.)
The Clairaut and Lagrange areolar equation
A contribution to the problem of coexistence of two periodical solutions of the Hill's equation
Factorization Of Polynomial Differential Operators
Elementary Solution of Vecua Equation With Analytic Coefficients on Z,
L'équation Non-homogene de Vécua
Amplitudes of linear oscillations determined by linear homogenous differential equation of the second order and Liouville-Besge formulae
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