@article{GDZPPN002109360,
title = {A mod k index theorem.},
journal = {Inventiones mathematicae},
volume = {110},
year = {1992},
pages = {283-300},
zbl = {0760.58039},
url = {http://dml.mathdoc.fr/item/GDZPPN002109360}
}
Freed, Daniel S.; Melrose, Richard B. A mod k index theorem.. Inventiones mathematicae, Tome 110 (1992) pp. 283-300. http://gdmltest.u-ga.fr/item/GDZPPN002109360/