@article{JRAM_1879__87_148405,
     author = {A. Cayley},
     title = {On a theorem relating to covariants.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {82--83},
     publisher = {mathdoc},
     volume = {87},
     year = {1879},
     zbl = {11.0081.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1879__87_148405/}
}