@article{01184339, title = {Geometry on the group of Hamiltonian diffeomorphisms.}, journal = {Documenta Mathematica}, year = {1998}, pages = {401-410}, zbl = {0909.58004}, language = {en}, url = {http://dml.mathdoc.fr/item/01184339} }
Polterovich, Leonid. Geometry on the group of Hamiltonian diffeomorphisms.. Documenta Mathematica, (1998), pp. 401-410. http://gdmltest.u-ga.fr/item/01184339/