  Light clusters are included in the equation of state of nuclear matter within
the relativistic mean field theory. The effect of the cluster-meson coupling
constants on the dissolution density is discussed. Theoretical and experimental
constraints are used to fix the cluster-meson couplings. The relative light
cluster fractions are calculated for asymmetric matter in chemical equilibrium
at finite temperature. It is found that above T = 5 MeV deuterons and tritons
are the clusters in larger abundances. The results do not depend strongly on
the relativistic mean field interaction chosen.
