TY  - BOOK
AU  - Erlander, Sven
AU  - Stewart, Neil F.
TI  - GRAVITY MODEL IN TRANSPORTATION ANALYSIS-THEORY AND EXTENSIONS
SN  - 9067640891
U1  - 625 
PY  - 1990///
CY  - Utrecht
PB  - Vsp
KW  - Transportation -- Mathematical Models
ER  -