Observational evidence of activity in galaxies 
edited by E. Ye Khachikian, Fricke, K. J and Melnick, J                                           
 - Dordrecht  D. Reidel Publishing  1987 
 - xxii, 601p. 
 - IAU Symposium; no. 121 .
<br/><br/><label>ISBN: </label>90-277-2474-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Active galaxies<br/>Astronomy and Astrophysics thesaurus<br/>Radio sources<br/>Seyfert galaxies
<br/><br/><label>Universal Decimal Class. No.: </label>082.2:52  / IAU-S121