Steroïd production by bovine follicles in vitro : influence of size, stage of cycle and culture system Th. A. M. KRUIP, S. J. DIELEMAN and R. M. MOOR Ann. Biol. anim. Bioch. Biophys., 19 5 (1979) 1537-1545 DOI: 10.1051/rnd:19790915