TY  - BOOK
AU  - Zieschang Heiner
AU  -  Coldewey Hans
AU  -  Vogi Elmar
TI  - Surfaces and planar discontinuous groups
T2  - Lecture notes in mathematics; 835
U1  - B27, M03 
PY  - 1980///
CY  - Berlin
PB  - Springer-Verlag         
N1  - Bibliography 311-329p
ER  -