Operating characteristics of the male hypothalamo-pituitary-gonadal axis: Pulsatile release of testosterone and follicle-stimulating hormone and their temporal coupling with luteinizing hormone - Veldhuis, J D; King, J C; Urban, R J; Rogol, A D; Evans, W S; Kolp, L A; Johnson, M L (J Clin Endocr Metab, 1987)