Nikolsky, S.M.. <br/><br/>
Course of Mathematical Analysis /  
translated by V.M. Volosov. 
 - 1st ed /  
 - Moscow :   MIR Publishers ,   1963 
 - p.441 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics 
<br/><br/><label>Dewey Class. No.: </label>B3  / L7.2;1