Decreased inhibin B secretion is associated with the monotropic FSH rise in older, ovulatory women: a study of serum and follicular fluid levels of dimeric inhibin A and B in spontaneous menstrual cycles - Klein,N.A.; Illingworth,P.J.; Groome,N.P.; McNeilly,A.S.; Battaglia,D.E.; Soules,M.R. (J Clin Endocrinol Metab, 1996)