Institution: | 1. University of Minnesota Duluth, Natural Resources Research Institute, Center for Water and Environment, 5013 Miller Trunk Hwy, Duluth, MN 55811, USA, (phone: +1‐218‐720‐4230;2. fax: +1‐218‐720‐4328);3. University of Minnesota Twin Cities, School of Statistics, 224 Church Street SE, Minneapolis, MN 55455, USA;4. University of Wisconsin‐Eau Claire, Department of Mathematics, Hibbard Hall 517, Eau Claire, WI 54701, USA |