1979 Funtion-Retaining (or Restoring) Surgery in Gynecology : Session A: Function-retaining or Restoring Surgery in the Diseases of the Uterus : Session B: Function-retaining or Restoring Surgery in the Pelvic Endometriosis, the Diseases of the Ovary and the Tube : Session C: Function-retaining or Restoring Surgery in Congenital and Acquired Lesions of the Lower Genital Tract