@article{MZ_1986__193_173775,
     author = {Huynh M\`ui},
     title = {Cohomology {Operations} {Derived} from {Modular} {Invariants.}},
     journal = {Mathematische Zeitschrift},
     pages = {151--164},
     publisher = {mathdoc},
     volume = {193},
     year = {1986},
     zbl = {0597.55019},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__193_173775/}
}