@article{01211005,
title = {Invariance of Poincar\'e-Lyapunov polynomials under the group of rotations.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {1998},
year = {1998},
zbl = {0924.58089},
language = {en},
url = {http://dml.mathdoc.fr/item/01211005}
}
Joyal, Pierre. Invariance of Poincaré-Lyapunov polynomials under the group of rotations.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 1998 (1998) . http://gdmltest.u-ga.fr/item/01211005/