Chhatwal, G R . <br/><br/>
Encclopedia of scientific and technical terms (VOL.14) /  
NULL. 
 - vol.14 /   . 
 - Delhi :   W East Ltd. ,   1983. 
 - NULL :   tables ;   NULL .  
<br/><br/>NULL 
<br/><br/><label>ISBN: </label> NULL (Hb)