@article{SM_2010_201_3_a3,
     author = {A. Yu. Savin and B. Yu. Sternin},
     title = {On the index of noncommutative elliptic operators over $C^*$-algebras},
     journal = {Sbornik. Mathematics},
     pages = {377--417},
     publisher = {mathdoc},
     volume = {201},
     number = {3},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2010_201_3_a3/}
}