Beckmann Martin J <br/><br/>
Spatial structures 

 - Berlin  Springer-Verlag            1990 
 - vii,139p.  cm. 
<br/><br/> Bib: p 131-33 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Regional Economics
<br/><br/><label>Dewey Class. No.: </label>X:89K:(B), N0