OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science, level 5-physics PS 

 - Nugegoda  The Open University of Sri Lanka  1989 
 - 119 p. 
<br/><br/><label>ISBN: </label>139520 
<br/><br/><label>Dewey Class. No.: </label>535.4  / OPE