Hafkamp, Wilhelmus A.,  1953- <br/><br/>
Economic-environmental modeling in a national-regional system :  an operational approach with multi-layer projection / 
Wilhelmus A. Hafkamp 
 - Amsterdam :  North-Holland,  1984 
 - 235 p. :  ill. ;  25 cm. 
 - Studies in regional science and urban economics ;  v.10 .
<br/><br/><label>ISBN: </label>0444875921 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental policy--Mathematical models