Reports on progress in physics  vol. XII, (91948-49) 
The Physical Society                                         
 - London  The Physical Society  1949 
 - 382p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics<br/>Progress
<br/><br/><label>Universal Decimal Class. No.: </label>53(047)  / PHY