@article{MAN_1889__34_157445,
     author = {Cayley},
     title = {On the finite {Number} of the {Covariants} of a {Binary} {Quantic.}},
     journal = {Mathematische Annalen},
     pages = {319--320},
     publisher = {mathdoc},
     volume = {34},
     year = {1889},
     zbl = {21.0104.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1889__34_157445/}
}