@article{MZ_1989__201_4_174036,
     author = {Alan Weinstein},
     title = {Cohomology of {Symplectomorphism} {Groups} and {Critical} {Values} of {Hamiltonians.}},
     journal = {Mathematische Zeitschrift},
     pages = {75--82},
     publisher = {mathdoc},
     volume = {201},
     number = {4},
     year = {1989},
     zbl = {0644.57024},
     url = {http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174036/}
}