Verhoeven, Jos T. A., Whigham, Dennis F., van Kerkhoven, M., O'Neill, John J., and Maltby, E. 1994. "
Comparative study of nutrient-related processes in geographically separated wetlands: towards a science base for functional assessment procedures." in
Global Wetlands: Old World and New, edited by Mitsch, W. J., 91–106. Amsterdam, The Netherlands: Elsevier.