\mu-\tau Symmetry and Maximal CP Violation
  We argue the possibility that a real part of a flavor neutrino mass matrix only respects a mu-tau symmetry. This possibility is shown to be extended to more general case with a phase parameter \theta, where the mu-tau symmetric part has a phase of \theta/2. This texture shows maximal CP violation and no Majorana CP violation. 
Teruyuki Kitabayashi, Masaki Yasue