found: Ecology of shallow lakes, 1998:t.p. (Marten Scheffer; RIZA, Lelystad, The Netherlands) p. 4 of cover (currently at the Dept. of Water Quality Management and Aquatic Ecology, Wageningen Agricultural Univ.)
found: Critical transitions in nature and culture, 2009:ECIP t.p. (Marten Scheffer) data view (Wagenigen U.; b. 1958)
found: SPARCS WWW site, May 22, 2018:About us; Core team (Martin Scheffer; research has focused on ecosystems, issues of stability and shift in natural and social systems; leads the South American Institute for Resilience and Sustainability Studies and the Aquatic Ecology and Water Quality Management group at Wageningen University; also a musician, playing violin, mandoline and guitar)