Vaught, Robert L. <br/><br/>
Set theory :  an introduction / 
Robert L. Vaught 
 - Boston, MA. :  Birkhauser,  1985 
 - 141 p. :  ill. ;  24 cm. 
<br/><br/>p. 135-136 
<br/><br/><label>ISBN: </label>0817632387 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Set theory