Bergeron, F et.al. <br/><br/>
Combinatorial Species and Tree-Like Structures   
by F Bergeron et.al. 
 - Cambridge  Cambridge University Press  1998 
 - xx,457p 
 - Encyclopedia of Mathematics and its Applications No.67 .
<br/><br/><label>ISBN: </label>9780521573238 
<br/><br/><label>Dewey Class. No.: </label>511.5  / N982