Wagniere, Georges Henry. <br/><br/>
Lecture Notes in Chemistry: Introduction to Elementary Molecular Orbital Theory and to Semiempirical Methods /  

 - 1st ed /  
 - Berlin-33 :   Springer-Verlag. 
 - p.109 :  
<br/><br/><label>ISBN: </label>3-540-07865-7 
<br/><br/><label>Dewey Class. No.: </label>E:218(B9:72)  / L6