Effect of polyethylene glycol, urea and sunflower meal supply on two-stage olive cake fermentation Ignacio Martín-García, David Yáñez-Ruiz, Abdelmajid Moumen and Eduarda Molina-Alcaide Anim. Res., 53 4 (2004) 245-257 DOI: 10.1051/animres:2004017