Multi-quasielliptic polynomials

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1. Oprea Berechet, Le problème de Cauchy pour opérateurs partiellement semi-elliptiques
2. J. Friberg, Principal parts and canonical factorisation of hypoelliptic polynomials in two variables
3. Oprea Berechet, Sur le problème de Cauchy pour les opérateurs partiellement multiquasi-elliptiques
4. P. Boggiatto, E. Buzano, Spectral asymptotics for multi-quasi-elliptic operators in ${ℝ}^n$
5. Lamberto Cattabriga, Moltiplicatori di Fourier e teoremi di immersione per certi spazi funzionali. II
6. Daniela Calvo, Cauchy problem in multi-anisotropic Gevrey classes for weakly hyperbolic operators