Bell, J. L. <br/><br/>
Models and ultraproducts :  an introduction / 
by J.L Bell, A. B. Slomson 
 - Amsterdam :  North-Holland Publishing Company,  1969 
 - 322 p. ;  23 cm. 
<br/><br/>Bibliography : p. 309-315 
<br/><br/><label>ISBN: </label>0720420547 
<br/><br/><label>LCCN: </label>78-087273 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Model theory<br/>Ultraproducts