@article{IM_1971__13_142086,
     author = {M. Herrera and D. Liebermann},
     title = {Duality and the {DeRham} {Cohomology} of {Infinitesimal} {Neighborhoods.}},
     journal = {Inventiones mathematicae},
     pages = {97--124},
     publisher = {mathdoc},
     volume = {13},
     year = {1971},
     zbl = {0218.32005},
     url = {http://geodesic.mathdoc.fr/item/IM_1971__13_142086/}
}