BEDDINY, E., HAMADA, M. I. (1981). 'ANATOMICAL AND FUNCTIONAL STUDIES ON THE DIGESTIVE SYSTEM OF VIVIPARUS UNICOLOR (OLIVIER, 1801) 1- THE OUTER MUSCULATURE OF THE BUCCAL MASS.', Assiut Veterinary Medical Journal, 8(15.16), pp. 81-86. doi: 10.21608/avmj.1981.191927