1. Systematics and economic botany of the Oenocarpus–Jessenia (Palmae) complex;Advances in Economic Botany,1986
2. Composition and structure of adjacent unflooded and floodplain forest in Amazonian Ecuador;Opera Botanica,1987
3. Ecuadorean forest east of the Andes,1989
4. A monographic study of the subfamily Phytelephantoideae (Arecaceae);Opera Botanica,1991
5. Notes on Oenocarpus (Palmae) in the Colombian Amazon;Brittonia,1991