Erlander Sven <br/><br/>
Optimal spatial interaction and the gravity models 
Erlander Sven 
 - Berlin  Springer Verlag           1980 
 - 107p.  cm. 
 - Lecture notes in economics and mathematical system, 13 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Transport Economics -- United States
<br/><br/><label>Dewey Class. No.: </label>X4:75:(B), M0