Wahl, Siegfried von. <br/><br/>
Investment appraisal and economic evolution of mining enterprise / 
Siegfried von Wahl. 
 - Clausthal-Zellerfeld, Germany :  Trans Tech Publications,  1983. 
 - 249 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0878490485 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mineral industries--Finance--Mathematical models.<br/>Investments--Mathematical models.