@article{05909742, title = {Erlangen program at large-1: geometry of invariants.}, journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]}, volume = {6}, year = {2010}, doi = {10.3842/SIGMA.2010.076}, zbl = {1218.30136}, language = {en}, url = {http://dml.mathdoc.fr/item/05909742} }
Kisil, Vladimir V. Erlangen program at large-1: geometry of invariants.. SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 6 (2010) . doi : 10.3842/SIGMA.2010.076. http://gdmltest.u-ga.fr/item/05909742/