1. Zaky, A. & Iskander, Z., 1943. Annales de Services des Antiquites de l’Egypte ,41, 295.
2. Hansen, R., 1977. North European Dairy J. ,43, 304.
3. Jensen, G.K., Olsen, P.M. & Hyldig, G., 1988. Scand. Dairy Industry ,3, 39.
4. Abd El-Salam, M.H., El-Shibiny, S. & Fahmi, A.H., 1976. N.Z. J. Dairy Sci. Technol. ,11, 57.
5. Lloyd, D.G.T. & Ramashaw, E.H., 1979. Aust. J. Dairy Technol. ,34, 180.