  Using intrinsic multiple Andreev reflection effect (IMARE) spectroscopy we
studied superconducting properties of nearly optimal oxygen-deficient
GdFeAsO$_{0.88}$ polycrystalline samples (bulk critical temperatures
$T_C^{bulk} = 49 \div 52$\,K). Temperature dependences for two superconducting
gaps $\Delta_{L,S}(T)$ ($T_C^{local} = 48 \div 50$\,K) have been measured in
the range from 4.2 to 50\,K. The $\Delta_{L,S}(T)$ dependences were found to
deviate from the BCS-like function; this suggests an importance of the
$k$-space (internal) proximity effect between the two condensates.
