We report on the study of the electron-quasiparticle interaction function i
n Ce1-xRExNi5 (RE = Pr, Nd) pseudobinary compounds for x = 0, 0.2, 0.5, 0.8
, and 1 measured by means of point-contact spectroscopy. The measured point
-contact spectra (d(2)V/dI(2) - directly proportional to the electron-quasi
particle interaction function) of the heterocontacts between Ce1-xRExNi5 an
d Cu in the ballistic regime are presented.