Harh, Amal Kumar <br/><br/>
Knowing a negative fact:  Anupalabdhi / 
by Amal Kumar Harh 
 - New Delhi:  New Bharatiya Book Corporation,  2001. 
 - iv, 144p. 
<br/><br/><label>Dewey Class. No.: </label>121.3  / HAR.K