Jacobs, K. <br/><br/>
Selecta mathematica,.  3. 

 - Berlin:  Springer,  1971. 
 - 154 p. 
 - Heidelberger taschenbucher. .
 - Heidelberger taschenbücher,  86. .
<br/><br/><label>Dewey Class. No.: </label>510.5  / J17s