@article{IM_1976__31_142361,
     author = {Arthur Ogus},
     title = {The {Formal} {Hodge} {Filtration.}},
     journal = {Inventiones mathematicae},
     pages = {193--228},
     year = {1976},
     volume = {31},
     zbl = {0339.14004},
     url = {http://geodesic.mathdoc.fr/item/IM_1976__31_142361/}
}