1. Coping with the epiphytic existence: pollination strategies;Ackerman;Selbyana,1986a
2. Mechanisms and evolution of food-deceptive pollination systems in orchids;Ackerman;Lindleyana,1986b
3. Limitations to sexual reproduction in Encvclia krugii (Orchidaceae);Ackerman;Systematic Botany,1989
4. Reproductive biology of Oncidium variegatum: moon phases, pollination, and fruit set;Ackerman;American Orchid Society Bulletin,1985
5. Four-year growth and reproduction of Cyclopogon cranichoides (Orchidaceae) in South Florida;Calvo;American Journal of Botany,1990