  In some black hole solutions, these do not exist the same energy-momentum
complexes associated with using definition of Einstein and M{\o}ller in given
coordinates. Here, we consider the difference of energy between the Einstein
and M{\o}ller prescription, and compare it with the energy density of those
black hole solutions. We found out a special relation between the difference of
energy between the Einstein and M{\o}ller prescription and the energy density
for considered black hole solutions.

General Relativity and Quantum Cosmology