Kwok, S. <br/><br/>
Cosmic butterflies :  the colorful mysteries of planetary nebulae / 
Sun Kwok. 
 - Cambridge ;  New York :  Cambridge University Press,  c2001. 
 - ix, 179 p. :  col. ill. ;  27 cm. 
<br/><br/>Includes bibliographical references (p. [169]-170) and index. 
<br/><br/><label>ISBN: </label>0521791359 
<br/><br/><label>LCCN: </label>00068867  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Planetary nebulae.
<br/><br/><label>LC Class. No.: </label>QB855.5  / .K957 2000 
<br/><br/><label>Dewey Class. No.: </label>523.1/135