1. DRAPRON, R., and GUILBOT, A. (1962) Ann. Technol. agric. 11, 175?218.
2. DUBOIS, M., GILLES, K.A., HAMILTON, J.K., REBERS, P.A., and SMITH, F. Anal. Chem. (1956) 28, 350?356.
3. GROUX, M. (1973) Schweiz. Milchz. 4, 2?8.
4. KOOPS, J., KLOMP, H., and ELGRSMA, R.H.C. (1975) Neth. Milk Dairy J. 29, 169?180.
5. MANCA DE NADRA, M.C., STRASSER DE SAAD, A.M., PESCE DE RUIZ HOLGADO, A.A., and OLIVER, G. (1985) Milchwissenschaft 40, 409?411.