1. Karr, J.R., K.D. Fausch, P.L. Angermeier, P.R. Yant and I.J. Schlosser. 1986 Assessing biological integrity in running waters, a method and its rationale Special Publication 5 Illinois Natural History Survey, Champaign, IL
2. What constitutes ecosystem health?;Rapport;Perspect Biol Med,1989
3. Ecosystem health 1 Measuring ecosystem health;Schaeffer;Environ Manage,1988
4. Costanza, R., B.Norton and B.Haskell, eds 1992 Ecosystem Health New Goals for Environmental Management Island, Washington, DC