  We discuss the behavior of weakly bound bosonic dimers formed in a cold Fermi
gas at a large positive scattering length $a$ for the interspecies interaction.
We find the exact solution for the dimer-dimer elastic scattering and obtain a
strong decrease of their collisional relaxation and decay with increasing $a$.
The large ratio of the elastic to inelastic rate is promising for achieving
Bose-Einstein condensation of the dimers and cooling the condensed gas to very
low temperatures.
