Neutrino masses, mixing and oscillations
  These are lectures given at the CERN-JINR school on high energy physics. The possibilities of the mixing of massive Dirac and Majorana neutrinos are discussed. The theory of neutrino oscillations in vacuum is presented. The trasitions between differen flavor neutrinos in matter are discussed. A short review of the results of the neutrino oscillation experiments is provided. 
S.M. Bilenky (Joint Institute for Nuclear Research, Dubna, Russia)