01163nam2-2200337li-450 99000331690020331620180918155417.0000331690USA01000331690(ALEPH)000331690USA010003316902002009091980-------y0itay0103----baengDEOptimal spatial interaction and the gravity modelSven ErlanderBerlin [etc.]Springer-Verlag1980107 p.graf. tav.24 cmLecture notes in operations research and mathematical economics1730010003315812001Lecture notes in operations research and mathematical economics173ERLANDER,Sven536336ITsalbcISBD990003316900203316650 LNES (173)8812/CBS65000328043BKSCIRSIAV69020090923USA010953RSIAV69020090923USA010954RSIAV69020090923USA010956RSIAV69020090923USA010957Optimal spatial interaction and the gravity model925214UNISA