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2. Association of Official Analytical Chemists. 1965. Official methods of analysis. 10th ed. Washington, DC.
3. Association of Official Analytical Chemists. 1980. Official methods of analysis. 11th ed. Washington, DC.
4. The recovery of proteins contained in the whey;Castiglioni;Ind. Aliment. Pinerolo,1969
5. An ultrafiltration technique for recovering milk clotting enzymes from whey;Chojnowshi;Lait,1979