Ryaben'kii, V.S <br/><br/>
Method of difference potentials & its applications 
V.S. Ryaben'kii 
 - Berlin  Springer  2002 
 - xviii  538 
 - Series in computational mathematics 30 .
<br/><br/><label>ISBN: </label>9783540426332 
<br/><br/><label>Dewey Class. No.: </label>11.02+11.04  / RYAB