Encyclopedia of astronomy and astrophysics  vol. 2, Gem - N 
edited by P. Murdin                                           
 - Bristol  Institute of Physics  2001 
 - 965 - 1898 p. 
<br/><br/><label>ISBN: </label>0-333-75088-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>astronomy<br/>astrophysics<br/>encyclopedia
<br/><br/><label>Universal Decimal Class. No.: </label>(031)52  / MUR