The only global contact transformations of order two or more are point transformations.
Alonso-Blanco, Ricardo J. ; Blázquez-Sanz, David
Journal of Lie Theory, Tome 15 (2005), p. 135-143 / Harvested from The Electronic Library of Mathematics
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Publié le : 2005-01-01
EUDML-ID : urn:eudml:doc:232597 
@article{02151029,
     title = {The only global contact transformations of order two or more are point transformations.},
     journal = {Journal of Lie Theory},
     volume = {15},
     year = {2005},
     pages = {135-143},
     zbl = {1073.58006},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02151029}
}

Alonso-Blanco, Ricardo J.; Blázquez-Sanz, David. The only global contact transformations of order two or more are point transformations.. Journal of Lie Theory, Tome 15 (2005) pp. 135-143. http://gdmltest.u-ga.fr/item/02151029/