@article{CRMATH_2016__354_12_1230_0,
     author = {Paradan, Paul-\'Emile},
     title = {Index of projective elliptic operators},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1230--1235},
     publisher = {Elsevier},
     volume = {354},
     number = {12},
     year = {2016},
     doi = {10.1016/j.crma.2016.10.018},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2016.10.018/}
}