Valenti, C (15 October 1972). “Endoamnioscopy and fetal biopsy: a new technique.”. American Journal of Obstetrics and Gynecology114 (4): 561–4. doi:10.1016/0002-9378(72)90220-7. PMID4653838.
Valenti, C (15 October 1972). “Endoamnioscopy and fetal biopsy: a new technique.”. American Journal of Obstetrics and Gynecology114 (4): 561–4. doi:10.1016/0002-9378(72)90220-7. PMID4653838.