1 literature reference for Trimeresurus occidentalis POPE 1933:

Author: Pope,C.H. & Pope, S.H.
Year: 1933
Title: A study of the green pit-vipers of southeastern Asia and Malaysia, commonly identified as Trimeresurus gramineus (SHAW), with description of a new species from Peninsular India.
Source: Amer. Mus. Nat. Hist. 620: 1-12