Fuzzy methods for assessing criteria and indicators of sustainable forest management. Ecological Indicators 3: 227–236.  online  Paterson, Barbara, Greg Stuart-Hill, Les G. Underhill, Tim T. Dunne, Britta Schinzel, Chris Brown, Ben Beytell, Fanuel Demas, Pauline Lindeque, Jo Tagg, and Chris Weaver. 2008. A fuzzy decision support tool for wildlife translocations into communal conservancies in Namibia, Environmental Modelling & Software Volume 23: 521–534. online  Porter, Andrea, Adel Sadek, and Nancy Hayden. 2006. Fuzzy Geographic Information Systems for Phytoremediation Plant Selection. Envir. Engrg. 132: 120. online  Saunders, M.C., T.J. Sullivan, B.L. Nash, K.A. Tonnessen, B.J. Miller. 2005. A knowledge-based approach for classifying lake water chemistry. Knowledge-Based Systems Volume 18: 47–54. online