Gram, W.K.; Borer, E.T.; Cottingham, K.L.; Seabloom, E.W.; Boucher, V.L.; Goldwasser, L.; Micheli, F.; Kendall, B.E.; Burton, R.S. 2004. Distribution of plants in a California serpentine grassland: Are rocky hummocks spatial refuges for native species? Plant Ecology. 172(2): 159-171.

Gram, W.K.; Borer, E.T.; Cottingham, K.L.; Seabloom, E.W.; Boucher, V.L.; Goldwasser, L.; Micheli, F.; Kendall, B.E.; Burton, R.S. 2004. Distribution of plants in a California serpentine grassland: Are rocky hummocks spatial refuges for native species? Plant Ecology. 172(2): 159-171.