@article{MZ_1987__195_183713,
     author = {T.Y. Lam and M.D. Choi and B. Reznick},
     title = {Even {Symmetric} {Sextics.}},
     journal = {Mathematische Zeitschrift},
     pages = {559--580},
     publisher = {mathdoc},
     volume = {195},
     year = {1987},
     zbl = {0654.10024},
     url = {http://geodesic.mathdoc.fr/item/MZ_1987__195_183713/}
}