  Detailed temperature dependence of both superconducting gaps was obtained
directly by means of SnS-Andreev spectroscopy. The \Delta \sigma,\pi(T) -curves
were shown to be deviated from standard BCS-like behavior, due to k-space
proximity effect between \sigma - and \pi - condensates, which could give a key
to experimental determination of interband electron-phonon coupling constants.
For the first time, an excellent qualitative agreement with theoretical
predictions of Nicol and Carbotte, and Moskalenko and Suhl was shown.
dI(V)/dV-spectra of SnS-Andreev contacts based on MgB2 samples (with defects of
crystal structure), and Mg(Al)B2 polycrystalline samples (with the local
critical temperatures Tc variation 10 K < Tc < 37 K) were studied by means of
the "break-junction" technique within the temperature range 4.2 K < T < Tc.
