  The surprising simplicity of Barvinsky-Nesterov or equivalently
Gelfand-Yaglom methods of calculation of quantum determinants permits to obtain
compact expressions for UV-finite difference of one-loop quantum energies for
two arbitrary values of parameter of the double-trace asymptotic boundary
conditions. This result generalizes Gubser and Mitra calculation for particular
case of difference of "regular" and "irregular" one-loop energies in one-brane
RS-model. Approach developed in the paper also allows to get "in one line" the
one-loop quantum energies in two-brane RS-model. The relationship between
"one-loop" expressions corresponding to mixed Robin and to double-trace
asymptotic boundary conditions is traced.
