01267nam a2200373 i 450099100120761970753620020507185236.0950218s1980 de ||| | eng 3540097295b10815648-39ule_instLE01308699ExLDip.to Matematicaeng380.50724AMS 90A15HE193Erlander, Sven536336Optimal spatial interaction and the gravity model /Sven ErlanderBerlin ; New York :Springer-Verlag,1980107 p. ;25 cm.Lecture notes in economics and mathematical systems,0075-8442 ;173Bibliography: p. [97]-102.Includes indexEconomic biologyEconomic modelsOptimizationPlanningTrade modelsTransportation.b1081564823-02-1728-06-02991001207619707536LE013 90A ERL11 (1980)12013000021645le013-E0.00-l- 00000.i1092226x28-06-02Optimal spatial interaction and the gravity model925214UNISALENTOle01301-01-95ma -engde 01