@article{IM_1992__109_2_144025,
     author = {Charles L. Epstein},
     title = {CR-structures on three dimensional circle bundles.},
     journal = {Inventiones mathematicae},
     pages = {351--404},
     year = {1992},
     volume = {109},
     number = {2},
     zbl = {0786.32013},
     url = {http://geodesic.mathdoc.fr/item/IM_1992__109_2_144025/}
}