@article{GDZPPN002067005, title = {Invariant theory of G2 and Spin7.}, journal = {Commentarii mathematici Helvetici}, volume = {63}, year = {1988}, pages = {624-663}, zbl = {0664.14006}, url = {http://dml.mathdoc.fr/item/GDZPPN002067005} }
Schwarz, Gerald W. Invariant theory of G2 and Spin7.. Commentarii mathematici Helvetici, Tome 63 (1988) pp. 624-663. http://gdmltest.u-ga.fr/item/GDZPPN002067005/