Willems, E P; Hill, R A (2009). A critical assessment of two species distribution models: a case study of the vervet monkey (Cercopithecus aethiops). Journal of Biogeography, 36(12):2300-2312.
Willems, E P; Hill, R A (2009). Predator-specific landscapes of fear and resource distribution: effects on spatial range use. Ecology, 90(2):546-555.
Willems, E P; Barton, R A; Hill, R A (2009). Remotely sensed productivity, regional home range selection, and local range use by an omnivorous primate. Behavioral Ecology, 20(5):985-992.