Freeman, Donald B. <br/><br/>
International trade, migration, and capital flows :  a quantitative analysis of spatial economic interaction / 
by Donald B. Freeman. 
 - Dept. of Geography, Chicago, Ill. :  University of Chicago,  1973. 
 - xiv, 201 p. :  ill. ;  23 cm. 
 - Research paper (University of Chicago. Dept. of Geography) ;  no.146. .
 - Research paper (University of Chicago. Dept. of Geography) ;  no.146. .
<br/><br/>Bibliography : p. 189-201. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>International economic relations--Mathematical models.<br/>International trade--Mathematical models.