@article {KNZ00268, title = {A hierarchical analysis of species abundance patterns in grassland vegetation}, journal = {The American Midland Naturalist}, volume = {135}, year = {1990}, pages = {633 -648}, keywords = {LTER-KNZ}, doi = {http://www.jstor.org/stable/2462027}, author = {Scott. L. Collins and Glenn, S.M.} }