@article{RM_1968_23_6_a4,
     author = {M. F. Atiyah and G. B. Segal},
     title = {The index of elliptic {operators.~II}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {23},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1968_23_6_a4/}
}