Spatial interaction theory and planning models - Karlqvist, Anders. (North-Holland Pub. Co. : distributors for the U.S.A. and Canada, Elsevier North-Holland, 1978)
"Papers presented at an international research conference in Bastad, Sweden, August 29-31, 1977 ... organized by the Research Group for Urban and Regional Planning, Department of Mathematics, Royal Institute of Technology, Stockholm."