Watercress and amphipods: potential chemical defense in a spring stream macrophyte. Journal of Chemical Ecology. 16:245-259.. 1990.
Watercress allelochemical defends high-nitrogen foliage against consumption: effects on freshwater invertebrate herbivores. Ecology. 77(8):2312-2323.. 1996.
Snail reaction to watercress leaf tissues: reinterpretation of a mutualistic 'alarm' hypothesis. Freshwater Biology. 40:201-213.. 1998.