@article{05241566, title = {Lie symmetries and criticality of semilinear differential systems.}, journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]}, volume = {3}, year = {2007}, zbl = {1142.35028}, language = {en}, url = {http://dml.mathdoc.fr/item/05241566} }
Bozhkov, Yuri; Mitidieri, Enzo. Lie symmetries and criticality of semilinear differential systems.. SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 3 (2007) . http://gdmltest.u-ga.fr/item/05241566/