Generalizations of the Perron-Frobenius theorem for nonlinear maps 
Nussbaum, Roger D., 
 - Providence, R.I. :  American Mathematical Society, 
 - viii, 98 p. ;  26 cm. 
<br/><br/> Volume 138 
<br/><br/><label>ISBN: </label>0821809695 (alk. paper)