TY  - JOUR
AU  - Joel Langer
AU  - David A. Singer
TI  - Diffeomorphisms of the Circle and Geodesic Fields on Riemannian Surfaces of Genus One.
JO  - Inventiones mathematicae
PY  - 1982
SP  - 229
EP  - 242
VL  - 69
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1982__69_142950/
ID  - IM_1982__69_142950
ER  -