1. Determination of Minute Amounts of Copper in Milk;Conn;Ind. Eng. Chem., Anal. Ed.,1935
2. Unpublished results cited in A Symposium on Copper Metabolism;Davis,1950
3. Report on Copper;Drabkin;J. Assoc. Offic. Agr. Chemists,1939
4. The Effect of Diet on the Copper Content of Milk;Elvehjem;J. Mol. Chem.,1929
5. Determination of Copper in Milk Powder by a Direct Carbamate Method;Hetrick;J. Milk Technol.,1945