I International Pontecorvo Neutrino Physics School (1998) II International Pontecorvo Neutrino Physics School (2003) III International Pontecorvo Neutrino Physics School (2007) IV International Pontecorvo Neutrino Physics School (2010) V International Pontecorvo Neutrino Physics School (2012) VI International Pontecorvo Neutrino Physics School (2015)