Concept of a Riemann surface 
Weyl, Hermann, 
 - 3rd ed. 
 - Massachusetts:   Addison-Wesley  1995 
 - x, 191 p. 
<br/><br/> Originally published: 3rd ed. Reading, Mass. : Addison-Wesley, 1955. | Includes index. 
<br/><br/><label>ISBN: </label>9780486470047 | 0486470040 | 64-14329 (hbk.