@article{IM_1977__39_142459,
     author = {J. Roitberg},
     title = {The {Signature} of {Quasi-Nilpotent} {Fiber} {Bundles}},
     journal = {Inventiones mathematicae},
     pages = {91--94},
     publisher = {mathdoc},
     volume = {39},
     year = {1977},
     zbl = {0334.55015},
     url = {http://geodesic.mathdoc.fr/item/IM_1977__39_142459/}
}