LEI, S. 2003. Environmental attributes correlating with density of blackbrush (Coleogyne ramosissima) shrubs in the Spring Mountains of southern Nevada. Western North American Naturalist 63:391–399.
LEI, S. 2004. Soil compaction from human trampling, biking, and off-road motor vehicle activity in a blackbrush (Coleogyne ramosissima) shrubland. Western North American Naturalist 63:125–130.