งานวิจัย ปี 2003
Nakaya, H., Saegusa, H., Ratanasthien, B., Kunimatsu, Y., Nagaoka, S.,
            Jhintaskul, P., Suganuma, Y. and Fukuchi, A. (2003), Neogene Mammalian
            Biostratigraphy and age of Fossil Ape from Thailand, Asian
               Paleoprimatology
, 3 : 66-67.
Nakaya, H., Saegusa, H., Ratanasthien, B., Kunimatsu, Y., Tsubamoto, T.,
           Nagaoka, S., Suganuma, Y., Chintaskul, P. and Thasod, Y. (2003). Late
           Cenozoic Mammalian Fauna of Thailand, In: Ratanasthien, B., Rieb, S. L.,
           and Chantraprasert, S. (eds.), The 8th International Congress on Pacific
              Neogene Stratigraphy: Pacific Paleoenvironments and Their Evolution
,
           Chiang Mai University, Thailand, pp. 90. 
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