  The possibility of measuring the second order correlation function of the
gravitational waves detectors' currents or photonumbers, and the observation of
the gravitational signals by using a spectrum analyzer is discussed. The method
is based on complicated data processing and is expected to be efficient for
coherent periodic gravitational waves. It is suggested as an alternative method
to the conventional one which is used now in the gravitational waves
observatories.

General Relativity and Quantum Cosmology