Convergence faible vers une classe de processus Gaussiens en norme de Besov anisotropique

We prove an approximation result of Donsker's type in anisotropic Besov spaces for a class of two parameter Gaussian processes. The particular case of the fractional Brownian sheet was considered in X. Bardina, C. Florit, Approximation in law to the d-parameter fractional Brownian sheet based on the functional invariance principle, Preprint, 2003] for the Banach space of continuous functions.