TY  - JOUR
AU  - R. J. Alonso-Blanco
AU  - D. Bl�zquez-Sanz 
TI  - The Only Global Contact Transformations of Order Two or More are Point Transformations
JO  - Journal of Lie theory
PY  - 2005
SP  - 135
EP  - 143
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JLT_2005_15_1_JLT_2005_15_1_a9/
ID  - JLT_2005_15_1_JLT_2005_15_1_a9
ER  -