1. Applied Biomathematics, 1990. Ramas Stage: Generalized Stage-based Modeling for Population Dynamics. Applied Biomathematics, Setauket, New York
2. Seeds: ecology, biogeography, and evolution of dormancy and germination;Baskin,1998
3. A new Helenium from Virginia;Blake;Claytonia,1936
4. Population viability analysis;Boyce;Annual Review of Ecology and Systematics,1992
5. Second derivatives of population growth rate: calculation and applications;Caswell;Ecology,1996