1. Adamus PR, Brandt K (1990) Impacts on quality of inland wetlands of the United States: a survey of indicators, techniques, and application of community-level biomonitoring data (EPA/600/3-90/073). United States Environmental Protection Agency, Environmental Research Laboratory, Corvallis, OR
2. Adamus P, Danielson TJ, Gonyaw A (2001) Indicators for monitoring biological integrity of inland, freshwater wetlands: a survey of North American technical literature (1990–2000) (EPA 843-R-01). United States Environmental Protection Agency, Office of Water, Washington, DC
3. Arnold CL Jr, Gibbons CJ (1996) Impervious surface coverage: the emergence of a key environmental indicator. J Am Plann Assoc 62:243–258
4. Balser TC, Firestone MK (2005) Linking microbial community composition and soil processes in a California annual grassland and mixed-conifer forest. Biogeochemistry 73:395–415
5. Bardgett RD, Shine A (1999) Linkages between plant litter diversity, soil microbial biomass and ecosystem function in temperate grasslands. Soil Biol Biochem 31:317–321