The contribution of the strong-coupling effects to the free energy of the
"dirty" superfluid 3He is estimated using a simple model. It is shown that
the strong-coupling effects are less susceptible to the quasiparticle
scattering events in comparison to the weak-coupling counterpart. This supports
the conclusion about stabilization of the B-phase in aerogel environment at
pressures where the A-phase takes over in bulk superfluid 3He, in
accordance with recent experimental observations in zero magnetic field.Comment: 10 pages, LaTeX file. This is a revised version of the paper with
some additional comments and references, and corrected typos. Submitted to
Journal of Physics: Condensed Matte