Weishampel, J. F., J. B. Blair, R. Dubayah, D. B. Clark, and R. G. Knox. “Canopy Topography of an Old-Growth Tropical Rain Forest Landscape”. Selbyana, vol. 21, no. 1/2, Oct. 2000, pp. 79-87, https://journals.flvc.org/selbyana/article/view/121720.