M. I.  Bidartondo, Kretzer, A. M., Pine, E. M., and Bruns, T. D., ?High root concentration and uneven ectomycorrhizal diversity near Sarcodes sanguinea (Ericaceae): a cheater that stimulates its vicitms??, Amer. J. Bot., vol. 87, pp. 1783 - 1788, 2000.