An index theorem for systems of difference operators on a half space
Publications Mathématiques de l'IHÉS, Tome 42 (1973), p. 121-127 
@article{PMIHES_1973__42__121_0,
     author = {Schaeffer, David G.},
     title = {An index theorem for systems of difference operators on a half space},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {42},
     year = {1973},
     pages = {121-127},
     zbl = {0274.47020},
     mrnumber = {47 \#9341},
     language = {en},
     url = {http://http://www.numdam.org/item/PMIHES_1973__42__121_0}
}

Schaeffer, David G. An index theorem for systems of difference operators on a half space. Publications Mathématiques de l'IHÉS, Tome 42 (1973) pp. 121-127. http://www.numdam.org/item/PMIHES_1973__42__121_0/

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