S.P. Singh,  . <br/><br/>
Econometrics and Mathematical Economics /  

 - Third Ed. /  
 - New Delhi-55 :   S. Chand & Company Ltd.. 
 - p.365,vi :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical Economics
<br/><br/><label>Dewey Class. No.: </label>X:(B)  / M4