LEADER 01163nam2-2200337li-450 001 990003316900203316 005 20180918155417.0 035 $a000331690 035 $aUSA01000331690 035 $a(ALEPH)000331690USA01 035 $a000331690 100 $a2002009091980-------y0itay0103----ba 101 0 $aeng 102 $aDE 200 1 $aOptimal spatial interaction and the gravity model$fSven Erlander 210 $aBerlin [etc.]$cSpringer-Verlag$d1980 215 $a107 p.$cgraf. tav.$d24 cm 225 2 $aLecture notes in operations research and mathematical economics$v173 410 0$1001000331581$12001$aLecture notes in operations research and mathematical economics$v173 700 1$aERLANDER,$bSven$0536336 801 $aIT$bsalbc$gISBD 912 $a990003316900203316 951 $a650 LNES (173)$b8812/CBS$c650$d00328043 959 $aBK 969 $aSCI 979 $aRSIAV6$b90$c20090923$lUSA01$h0953 979 $aRSIAV6$b90$c20090923$lUSA01$h0954 979 $aRSIAV6$b90$c20090923$lUSA01$h0956 979 $aRSIAV6$b90$c20090923$lUSA01$h0957 996 $aOptimal spatial interaction and the gravity model$9925214 997 $aUNISA