Korovkin, P.P.. <br/><br/>
Inequalities /  

 - 1st ed /  
 - Oxford :   Pergamon Press Ltd.. 
 - p.60 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>Bx58`N6  / K1