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The gravity model in transportation analysis- theory and extensions Erlander, Sven by Series: Topics in transportation
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Utrecht VSP 1990
Availability: Items available for loan: Ahmedabad (1)Call number: 380.5 E7G7.

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Optimal spatial interaction and the gravity model Erlander, Sven by Series: Lecture notes in economics and mathematical systems,no. 173
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Berlin Springer-Verlag 1980
Availability: Items available for loan: Ahmedabad (1)Call number: 380.5018 E7O7.

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