Alling, Norman L. and Greenleaf, Newcomb <br/><br/>
Foundations of the theory of Klein surfaces   

 - Berlin  Springer-Verlag  1971 
 - viii, 117p. 
 - Lecture notes in Mathematics   219 .
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<br/><br/><label>Dewey Class. No.: </label>515.9  / Al437.FT