Two Yoginis of Hevajra from Thailand by J.J. Boeles Two female dancers statuettes discovered in the 1950s and what they tell us about Khmer art and religion, Tantric Buddhism and the cult of Hevajra. In English
Note on Archaelogical Survey and Excavations in North-Eastern Thailand in 1959 by J.J. Boeles A useful summary of archeological research in Northeastern Thailand at the end of the 1950s In English