We have found transitions to chaos via type-I and -II intermittencies with
two channels of reinjection instead of only one. There are just two unstabl
e tori at the same value of the parameter, because of the symmetry in the s
ystem. This symmetry is responsible for this unusual behavior. These interm
ittencies show two different laminar regimes. (C) 1999 Elsevier Science Ltd
. All rights reserved.