Landolt-Bornstein,  . <br/><br/>
Numerical Data and Functional Relationships in Science and Technology /  

 - 1st ed /  
 - Berlin :   Springer-Verlag. 
 - p.305 :  
<br/><br/><label>ISBN: </label>3-540-10054-7 
<br/><br/><label>Dewey Class. No.: </label>B33(F):1  / K5.2-1