Maurizio Canavari, Università di Bologna Alma Mater Studiorum, Bologna, Italy; Kent D. Olson, University of Minnesota Dept. Applied Economics, St. Paul, MN, USA / 2007-05-11 / Springer New York
Alina Kabata-Pendias, Inst. of Soil Science and Plant Cultivation, Pulawy, Poland; Arun B. Mukherjee, University of Helsinki Dept. Limnology and, Helsinki, Finland / 2007-04-04 / Springer Berlin Heidelberg