Biggs, Norman. <br/><br/>
Finte Groups of Automorphisms /  

 - 1st ed /  
 - London W.1 :   Cambridge University Press ,   1980 
 - p.117 :  
<br/><br/><label>ISBN: </label>0-521-08215-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B271  / L1;1