TY  - RPRT
TI  - Why three generations?
AU  - Ibe, Masahiro
AU  - Kusenko, Alexander
AU  - Yanagida, Tsutomu T.
PY  - 2016
DO  - 10.1016/j.physletb.2016.05.025
UR  - https://www.osti.gov/biblio/1253026
ID  - 1253026
ER  -