Wiens, F.; Zitzmann, A., Lachance, M.-A., Yegles, M., Pragst, F., Wurst, F. M., von Holst, D., Guan, S. L., Spanagel, R. (2008): "Chronic intake of fermented floral nectar by wild tree-shrews". Proceedings of the National Academy of Sciences105 (30): 10426–10431. ResumoArquivado 24 de outubro de 2013 en Wayback Machine..
Wiens, F.; Zitzmann, A., Lachance, M.-A., Yegles, M., Pragst, F., Wurst, F. M., von Holst, D., Guan, S. L., Spanagel, R. (2008): "Chronic intake of fermented floral nectar by wild tree-shrews". Proceedings of the National Academy of Sciences105 (30): 10426–10431. ResumoArquivado 24 de outubro de 2013 en Wayback Machine..