@article{AIF_1997__47_1_305_0,
     author = {Zelditch, Steven},
     title = {Index and dynamics of quantized contact transformations},
     journal = {Annales de l'Institut Fourier},
     pages = {305--363},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {47},
     number = {1},
     year = {1997},
     doi = {10.5802/aif.1568},
     mrnumber = {99a:58082},
     zbl = {0865.47018},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.1568/}
}