  Studies on the X(4260) and X(4660) resonant states in an effective lagrangian
approach are reviewed. Using a Breit--Wigner propagator to describe their
propagation, we find that the X(4260) has a sizable coupling to the
$\omega\chi_{c0}$ channel, while other couplings are found to be negligible.
Besides, it couples much stronger to $\sigma$ than to $f_0(980)$: $|g_{X\Psi
\sigma}^2/g^2_{X\Psi f_0(980)}|\sim O(10) \ .$ As an approximate result for
X(4660), we obtain that the ratio of
$\frac{Br(X\rightarrow\Lambda_c^+\Lambda_c^-)}{Br(X\rightarrow\Psi(2s)\pi^+\pi^-)}\simeq
20$. Finally, taking X(3872) as an example, we also point out a possible way to
extend the previous method to a more general one in the effective lagrangian
approach.
