@article{SM_1971_13_4_a2,
     author = {M. A. Shubin},
     title = {On the index of families of {Wiener{\textendash}Hopf} operators},
     journal = {Sbornik. Mathematics},
     pages = {529--551},
     year = {1971},
     volume = {13},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_13_4_a2/}
}