1. Double beta decay;Elliot;J. Phys. G: Nucl. Part. Phys.,2004
2. EXO project, at 〈http://www-project.slac.stanford.edu/exo/〉.
3. CUORE project, Gran Sasso National Laboratory, Italy, at 〈http://www.lngs.infn.it/〉.
4. GERDA project, Gran Sasso National Laboratory, Italy at 〈http://www.lngs.infn.it/〉.
5. DIRECT DETECTION OF DARK MATTER