@article{IM_1987__89_143486,
     author = {J.A., Donagi, R. Carlson},
     title = {Hypersurface variations are maximal, {I.}},
     journal = {Inventiones mathematicae},
     pages = {371--374},
     publisher = {mathdoc},
     volume = {89},
     year = {1987},
     zbl = {0639.14003},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__89_143486/}
}