@article{EJDE_2004__2004__a66,
     author = {Bakker,  Lennard F.},
     title = {Structure of group invariants of a quasiperiodic flow},
     journal = {Electronic journal of differential equations},
     year = {2004},
     volume = {2004},
     zbl = {1050.37011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a66/}
}