00366nam a2200121Ia 4500082002000000100004500020245005000065260003400115300001600149490003900165500000500204700003500209  a515.9bAl437.FT  aAlling, Norman L. and Greenleaf, Newcomb  aFoundations of the theory of Klein surfacesb  aBerlinbSpringer-Verlagc1971  aviii, 117p.  aLecture notes in Mathematicsv 219  a  aGreenleaf, Newcomb ; jt. auth.