TY  - JOUR
AU  - Louis Block
AU  - John Franke
TI  - Existence of Periodic Points of Maps of S1.
JO  - Inventiones mathematicae
PY  - 1973
SP  - 69
VL  - 22
PB  - mathdoc
UR  - https://geodesic-test.mathdoc.fr/item/IM_1973__22_142241/
LA  - un
ID  - IM_1973__22_142241
ER  -