Jacobs, K. <br/><br/>
Selecta mathematica,.  4. 

 - Berlin:  Springer,  1972. 
 - 184 p. 
 - Heidelberger taschenbucher. .
 - Heidelberger taschenbücher,  98. .
<br/><br/><label>Dewey Class. No.: </label>510.5  / J17s