OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science-physics PSU 2111int 

 - Nugegoda  The Open University of Sri Lanka  1988 
 - 88 p. 
<br/><br/><label>ISBN: </label>139514 
<br/><br/><label>Dewey Class. No.: </label>536.7  / OPE