OPEN Univeristy of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science level 4: physics PS 

 - Nugegoda  The Open University of Sri Lanka  1986 
 - 126 p. 
<br/><br/><label>ISBN: </label>139508 
<br/><br/><label>Dewey Class. No.: </label>537.5  / OPE