1. A new Ammandra (Palmae) from Ecuador;Balslev;Syst. Bot.,1987
2. A monographic study of the subfamily Phytelephantoideae (Arecaceae);Barfod;Opera Bot.,1991
3. The vegetable ivory industry: surviving and doing well in Ecuador;Barfod;Econ. Bot.,1990
4. Uses and management of Aphandra natalia (Palmae) in Ecuador;Borgtoft Pedersen;Bull. Inst. Fr.Études Andines,1992
5. Extractivism in Ecuador with special emphasis on management and economic exploitation of native palms (Arecaceae);Borgtoft Pedersen,1993