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2. Natural Flavouring Substances, Their Sources, and Added Artificial Flavouring Substances;Council of Europe,1974
3. Survey of flavoring ingredient usage levels;Flavoring Extract Manufacturers' Association;Fd Technol., Champaign,1965
4. Prepared by the Committee on Specifications, Food Chemicals Codex, of the Committee on Food Protection;Food Chemicals Codex,1972