International Congress on Plant Tissue and Cell Culture (7th : 1990 : Amsterdam, Netherlands), Mexico, Tropical Botanic Garden and Research Institute (Trivandrum, India), In vitro propagation, Nepenthes, In vitro culture, Royal Botanic Gardens, Kew, Micropropagation, National Botanic Garden of Belgium, and Cacti
Raja Ampat (Indonesia), Limestone, Biak, Endemic, Nepenthes, Critically endangered, Papua Barat (Indonesia), and Indonesia
Jack, William (1795-1822), Sumatra, Rafflesia, Nepenthes, and Effective publication
