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N. Tenzin, S. Bumrungsri, and C. Satasook, “Geographical Variation within the Species Ratufa bicolor (Sparrman, 1778) Inferred from External and Cranial Morphology (Sciuridae: Ratufinae) in Thailand”, Thai. Nat. Hist. Mus. J., vol. 7, no. 1, pp. 1–10, May 2013.