@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},
     mrnumber = {720289},
     zbl = {0576.14008},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1983__50_2-3_207_0/}
}