@article{IM_1973__19_142198,
     author = {M. Atiyah and R. Bott and V.K. Patodi},
     title = {On the {Heat} {Equation} and the {Index} {Theorem.}},
     journal = {Inventiones mathematicae},
     pages = {279--330},
     year = {1973},
     volume = {19},
     zbl = {0257.58008},
     url = {http://geodesic.mathdoc.fr/item/IM_1973__19_142198/}
}