@article{GDZPPN002252449,
title = {A simple Proof of the Existence of Irreducible Invariants of Degrees 20 and 30 for the Binary Seventhic},
journal = {Mathematische Annalen},
volume = {35},
year = {1890},
pages = {255-261},
zbl = {22.0146.02},
url = {http://dml.mathdoc.fr/item/GDZPPN002252449}
}
Hammond. A simple Proof of the Existence of Irreducible Invariants of Degrees 20 and 30 for the Binary Seventhic. Mathematische Annalen, Tome 35 (1890) pp. 255-261. http://gdmltest.u-ga.fr/item/GDZPPN002252449/