Ramasamy, R <br/><br/>
Journal of the national science council of Sri Lanka  March 1995 

 - Colombo  NARESA 
 - [2],54 p.  Illustration 
 - Journal of the national science council of Sri Lanka, March 1995  Vol. 23 .
<br/><br/><label>Dewey Class. No.: </label>B0416  / LDC