Ed. INRA-SAD, Paris, 1993. 334 p.
Stanford University - ANMALIBRI, Saratoga, Cal. 95071 - USA ; et CREA, Ecole Polytechnique, Paris, vol. 15. 1-2.1991.
Ed. AFCET-CREIS, Paris 1994. 120 p.
Revue Economie Rurale, (SFER), Paris 1990