@article{IM_1989__97_2_143712,
     author = {V. Guillemin and S. Sternberg},
     title = {Birational equivalence in the symplectic category.},
     journal = {Inventiones mathematicae},
     pages = {485--522},
     publisher = {mathdoc},
     volume = {97},
     number = {2},
     year = {1989},
     zbl = {0683.53033},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__97_2_143712/}
}