"Resistance may be futile: dispersal scales and selection for disease resistance in competing plants", by David Brown and Alan Hastings. Appeared in Journal of Theoretical Biology 222:373--388.

"Modeling direct positive feedback between predators and prey",
by David Brown, Howard Ferris, Shenglei Fu, and Richard Plant.
Appeared in Theoretical Population Biology 65:143-152.

"The effects of disease dispersal and host clustering on the epidemic threshold in plants", by David Brown and Benjamin Bolker.  Appeared in Bulletin of Mathematical Biology 66:341-371.