New advances in ultra–stable microwave oscillatorsV. Giordano, P. Y. Bourgeois, Y. Gruson, N. Boubekeur, R. Boudot, E. Rubiola, N. Bazin and Y. KersaléEur. Phys. J. Appl. Phys., 32 2 (2005) 133-141DOI: https://doi.org/10.1051/epjap:2005078