INTERNATIONAL ASTRONOMICAL UNION COLLOQUIUM(125th <br/><br/>
"Radio recombination lines - 25 years of investigation. Proceedings of the 125th IAUC, Pushchino, USSR, Sept 11-16, 1989" 

 - Dordrecht  Kluwer  1990 
 - xi p. + 295 
 - Astrophysics and Space Science Library Vol.163 .
<br/><br/><label>ISBN: </label>0-7923-0804-2