1. Meeting on Medicinal Plants and Malaria, Ministry of University Affairs, Bangkok, Thailand, 10 November, 1989
2. Quaternary Alkaloids of Tinospora Species
3. Pachaly, P., Schneider, (1981) C. Arch. Pharm 314. 251. (Chem. Abstr. 95 (1981) 3352 p).
4. Clerodane diterpenoids