@article{CM_1983__50_2-3_207_0, author = {Griffiths, Phillip and Harris, Joe}, title = {Infinitesimal variations of hodge structure {(II)} : an infinitesimal invariant of hodge classes}, journal = {Compositio Mathematica}, pages = {207--265}, publisher = {Martinus Nijhoff Publishers}, volume = {50}, number = {2-3}, year = {1983}, zbl = {0576.14008}, mrnumber = {720289}, language = {en}, url = {http://archive.numdam.org/item/CM_1983__50_2-3_207_0/} }