TY  - BOOK
AU  - Freeman, Donald B
TI  - International trade, migration, and capital flows: a qualitative analysis of spatial economic interaction 
AV  - HF 1007 F74
PY  - 1973///
CY  - Chicago
PB  - The University of Chicago. Department of Geographiy
KW  - Comercio exterior
KW  - Economía matemática
N1  - Incluye bibliografía
ER  -