Ramasamy, R <br/><br/>
Journal of the national science council of Sri Lanka  September1994 

 - Colombo  NARESA 
 - [2],86 p.  Illustration 
 - Journal of the national science council of Sri Lanka, September 1994  Vol. 22 .
<br/><br/><label>Dewey Class. No.: </label>B0416  / LDC