Spitzer, F <br/><br/>
Principles of random walk 
F. Spitzer 
 - New York  Springer  1976 
 - xiii  408 
 - Graduate texts in mathematics 34 .
<br/><br/><label>ISBN: </label>3540901507 
<br/><br/><label>Dewey Class. No.: </label>16.03  / SPIT