The quasi-ternary heavy-fermion systems Ce(Cu1-xNix)(2)Ge-2 and CeCu2(
Si1-yGey)(2) are investigated by means of magnetic resonance. Starting
with the common CeCu2Ge2 both systems exhibit an alloying-induced tra
nsition from antiferromagnetic order to a coherent Fermi-liquid behavi
or in CeNi2Ge2 and CeCu2Si2, respectively.