Nauk P A <br/><br/>
Dissertations mathematicae 

 -  1981 
 - 186p.  cm. 
<br/><br/><label>Standard No.: </label>20898 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B281, M1