1. Outlines of Enzyme Chemistry;Neilands,1958
2. Crystalline Enzymes;Northrop,1948
3. Chemistry and Methods of Enzymes;Sumner,1953
4. Enzymes;Dixon,1958
5. Barraquer, J.: Zonulolisis enzimatica. Communicacion a la Real Academia De Medicinia De Barcelona, April, 1958.