00462nam a2200121Ia 450000500170000000800410001702000140005808200140007210000220008624500520010826001220016065000580028220250107154531.0241216s9999||||xx |||||||||||||| ||und||  a444851828  a330.20184  aAnders Karlqvist  0aSpatial interaction theory and planning models   aAmsterdam ;;New York bNorth-Holland Pub. Co. : distributors for the U.S.A. and Canada, Elsevier North-Holland,c1978  aRegional economics;Urban economics;Space in economics