1. Bhattacharya SC, Shrestha RM. Biotechnology and economics, RFRIC Asian Institute of Technology (AIT) Bangkok, 1990, ISBN 974-888201-441.
2. A survey of uncarbonised briquettes and bicoal markets in Thailand;Bhattacharya;RERIC International Journal,1989
3. Carre J, Huber J, Lacrose J. Critical analysis of dry process improvement of materials for energy producing purposes. Final report ADE/958/83-BDF/1, center de Recherche Agronomique.
4. Compression of straw to high densities in close cylindrical dies;O'Dogherty;Journal of Agricultural Engineering,1984
5. Ooi CC, Bari S, Siddiqui KM. Densification and properties of briquetted wastes. Renewable Energy 1998;16:1981–4.