Leser, C.E.V.. <br/><br/>
Econometric Techniques and Problems /  

 - Second Ed. /  
 - London WC2B 5RX :   Charles Griffin & Company Ltd. ,   1987 
 - p.144 :  
<br/><br/><label>ISBN: </label>0-85264-218-0 
<br/><br/><label>Dewey Class. No.: </label>X)bB28  / L4L