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3. Association of Official Agricultural Chemists, 1960. Official Methods of Analysis, 9th ed., Washington, D.C.
4. Studies on the improvement of egg yolk color 2. Additional information on the value of local commercial pigmenters;Bartov;Meshek Ha'ofot,1964
5. Studies on egg yolk pigmentation. 2. Effect of ethoxyquin on xanthophyll utilization;Bartov;Poultry Sci.,1966