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Amornrat Ratanakietthavorn. Quantitative analysis of codeine phosphate in preparations using 31P-NMR techniques. . Bangkok:Chulalongkorn University, 1989.
Amornrat Ratanakietthavorn. (1989) Quantitative analysis of codeine phosphate in preparations using 31P-NMR techniques . Chulalongkorn University/Bangkok.