open University <br/><br/>
Open University: Mathematics 
open University 
 -  1975 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>31449 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D65,8(B), L5.15