@article{10_4007_annals_2010_171_1647,
     author = {Erik van Erp},
     title = {The {Atiyah-Singer} index formula for subelliptic operators on contact manifolds. {Part} {I}},
     journal = {Annals of mathematics},
     pages = {1647--1681},
     publisher = {mathdoc},
     volume = {171},
     number = {3},
     year = {2010},
     doi = {10.4007/annals.2010.171.1647},
     mrnumber = {2680395},
     zbl = {1206.19004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2010.171.1647/}
}