Stephani, Hans <br/><br/>
Differential equation :  their solution symmetries / 
Hans Stephani ; edited by Malcolm Maccallum 
 - Cambridge :  Cambridge University Press,  1989 
 - 260 p. ;  23 cm. 
<br/><br/><label>ISBN: </label>0521366895 
<br/><br/><label>LCCN: </label>88-036744 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations--Numerical solutions<br/>Symmetry