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Swemmer AM, Knapp AK, Snyman HA. Intra-seasonal precipitation patterns and aboveground productivity in three perennial grasslands. Journal of Ecology. 2007;95:780 -788. doi:10.1111/j.1365-2745.2007.01237.x.

Swemmer AM, Knapp AK, Smith MD. Growth responses of twodominant C4 grass species to altered water availability. InternationalJournal of Plant Sciences. 2006;167:1001 -1010. doi:10.1086/505611.