Chetwynd, A and Diggle, P <br/><br/>
Discrete mathematics  Paper 
A Chetwynd and P Diggle 
 - New Delhi  Butterworth Heinemann  2001 
<br/><br/><label>ISBN: </label>0-340-61047-6   
<br/><br/><label>Dewey Class. No.: </label>511.1  / CHE