Phillps data and Handbook  pt. 4, magnetic materials- white ceramics 
Philips Gloeilanapenfabrieken 
 - Netherland  Technical Publications Department  1969 
 - [various pagings.] 
<br/><br/><label>ISBN: </label>9399-491-07301 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and Astrophysics Thesaurus<br/>Electronics
<br/><br/><label>Universal Decimal Class. No.: </label>(035)621.38  / PDH-69:4