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Cheung, H.T. and Feng, M.C. (1968) Constituents of dipterocarpaceae resins. Part I. Triterpene acids of Dryobalanops aromatica. Journal of the Chemical Society C: Organic. pp. 1047-1051. ISSN 0022-4952, DOI https://doi.org/10.1039/j39680001047.
Cheung, H.T. (1968) Constituents of dipterocarpaceae resins. Part II. Structure of dryobalanone from Dryobalanops aromatica. Journal of the Chemical Society C: Organic. pp. 2686-2689. ISSN 0022-4952, DOI https://doi.org/10.1039/j39680002686.
Carrick, John and Chan, K.C. and Cheung, H.T. (1968) A New Phytochemical Survey of Malaya-Chemical Screening. Chemical and Pharmaceutical Bulletin, 16 (12). pp. 2436-2441. ISSN 0009-2363, DOI https://doi.org/10.1248/cpb.16.2436.
Cheung, H.T. and Tőkés, L. (1968) Oxygenated derivatives of asiatic acid from dryobalanops aromatica. Tetrahedron Letters, 9 (41). pp. 4363-4366. ISSN 0040-4039, DOI https://doi.org/10.1016/S0040-4039(01)99132-4.