1. Vibol Sao, Paitip T. and Woranan N., "Comparison of Cadmium Uptake by Cyperrus rotundas Linn and Axonopus Compressus (SW.) P. Beav", Proceeding on Sustainable Energy and Environment (SEE), December 1-3, 2004, Hilton Huo Hin Resort & Spa, Hua Hin, Thailand.

2. Vibol Sao, "Phytoremediation of Cadmium in Contaminated Water", the 7^th Socio-Cultural Research Congress on Cambodia, Phnom Penh, Cambodia.