  The interactions of gravitational waves with interstellar matter, dealing
with resonant wave-particle and wave-wave interactions, are considered on the
basis of magnetic-type Maxwell-Vlasov equations. It is found that the behavior
of the fields, involving the "gravitoelectromagnetic" or "GEM " fields, the
perturbed density field and self-generated gravitomagnetic field with low
frequency,can be described by the nonlinear coupling equations Eqs.
(6.10)-(6.12). Numerical results show that they may collapse. In other words,
due to self-condensing, a stronger GME fields could be produced; and they could
appear as the gravitational waves with high energy reaching on Earth. In this
case, Weber's results, perhaps, are acceptable.
