Graovac, Ante. <br/><br/>
Topological Approach to the Chemistry of Conjugated Molecules /  

 - 1st ed /  
 - Berlin-33 :   Springer-Verlag. 
 - p.123 :  
<br/><br/><label>ISBN: </label>3-540-08431-2 
<br/><br/><label>Dewey Class. No.: </label>E:(B316)  / L7