Neutrino Mass Textures with Maximal CP Violation
  We have found three types of neutrino mass textures, which give maximal CP-violation as well as maximal atmospheric neutrino mixing. These textures are described by six real mass parameters: one specified by two complex flavor neutrino masses and two constrained ones and the others specified by three complex flavor neutrino masses. In each texture, we calculate mixing angles and masses as well as Majorana CP phases. 
Ichiro Aizawa, Teruyuki Kitabayashi, Masaki Yasue