Donner Klaus <br/><br/>
Extension of positive operaters and korovkin theorems. 
Donner Klaus 
 -  1982 
<br/><br/><label>Standard No.: </label>82073 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B43, M2