Encyclopaedia of Physical Science and Technology :   Volume 4 ( Crys-Elec ) 
/ by Academic press 
 - London:  Academic press,  1987. 
 - 891p. 
<br/><br/><label>ISBN: </label>0122269047 
<br/><br/><label>Dewey Class. No.: </label>503.21  / ENC/E