Non-linear and quantum optics of a type II OPO containing a birefringent element - 1. Classical operationL. Longchambon, J. Laurat, T. Coudreau and C. FabreEur. Phys. J. D, 30 2 (2004) 279-285DOI: https://doi.org/10.1140/epjd/e2004-00090-6