1. Angelova PA, Davidoff MS, Kanchev LN (1991a) Substance P inhibits testosterone secretion of isolated Leydig cells. Andrologia 23:325–327
2. Angelova P, Davidoff M, Baleva K, Staykova M (1991b) Substance P and neuron-specific enolase-like immunoreactivity of rodent Leydig cells in tissue section and cell culture. Acta Histochem 91:131–139
3. Bardin CW, Chen C-LC, Morris PL, Gerendai I, Boitani C, Liotta AS, Margioris A, Krieger DT (1987) Proopiomelanocortin-derived peptides in testis, ovary, and tissues of reproduction. Rec Progr Horm Res 43:1–28
4. Bardin CW, Morris PL, Chen CLC (1990) Autocrine and paracrine gonadal peptides. In: Bouchard P, Haour F, Franchimont P, Schatz B (eds) Recent Progress on GnRH and Gonadal Peptides. Elsevier, Paris, pp 367–382
5. Benahmed M, Esposito G, Sordoillet C, Peretti E de, Chauvin MA, Ghiglieri C, Revol A, Morera AM (1989) Transforming growth factor β and its peptides in the testis: an intragonadal polypeptide control system. In: Serio M (ed) Serono Symposia Publications, vol 53, Perspectives in Andrology. Raven Press, pp 191–201