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Hadi Poerwono and Kimio Higashiyama and Hajime Kubo and Achmad Toto Poernomo, NIDN0018095905 and Suharjono and I Ketut Sudiana and Gunawan Indrayanto and Harry G. Brittain (2001) Citric Acid. In: Analytical Profiles of Drug Substances and Excipients. Academic Press, San Diego, pp. 1-76. ISBN 0-12-260828-3