1998  Zhou & Liengjarern, p.36: 42.5 km W of Khao Nong Hoi,  Amphoe Pak Chong locality.
     2004  Zhou & Liengjarern, p.318, fig.1: quarry, 4.25 km S of the Khao Plong Phrab section, Amphoe Phra Phutthabat,
Changwat Saraburi; Map 5138 II, Grid 9640-2235. SBQ.