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Shen, T.C. (1969) The induction of nitrate reductase and the preferential assimilation of ammonium in germinating rice seedlings. Plant Physiology, 44 (11). pp. 1650-5. ISSN 0032-0889, DOI PMCID: PMC396318.
Yong, Hoi Sen (1969) Karyotypes of Malayan rats (Rodentia-Muridae, genus Rattus Fischer). Chromosoma, 27 (3). pp. 245-267. ISSN 0009-5915, DOI https://doi.org/10.1007/BF00326164.
Yong, Hoi Sen (1969) Karyotypes of Three Species of Rats from Hong Kong and Thailand (Muridae, genus Rattus Fischer). Cytologia, 34 (3). pp. 394-398. ISSN 0011-4545, DOI https://doi.org/10.1508/cytologia.34.394.