Liaqat, Asia <br/><br/>
Second-Order Approximate Lie Symmetry Methods to Define Energy Content of Some Spacetimes/ 
Asia Liaqat,  
 - 141,p;  ill;  30,cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PhD-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>200