[STUDIES ON THE STABILITY OF GONADOTROPIC HORMONES OF THE PITUITARY GLAND IN ADULT CATTLE, CALVES AND SWINE]. - LEWIN H; SEEGER E; LABACH H (Gynaecologia. International monthly review of obstetrics and gynecology. Revue internationale mensuelle d'obstetrique et de gynecologie. Monatsschrift fur Geburtshilfe und Gynakologie, 1964)