TY  - BOOK
AU  - Beckmann,Martin
AU  - Puu,Tonu
TI  - Spatial economics: density, potential and flow 
U1  - 338.6042 
PY  - 1985///
CY  - Oxford
PB  - North-Holland
KW  - Regional economics
KW  - Space in economics
N1  - Includes bibliographical references and index
ER  -