Schemes of Neutrino Mixings (Oscillations) and Their Mixing Matrices
  Three schemes of neutrino mixings (oscillations) together with their mixing matrices (analogous to Kabibbo-Kobayashi-Maskawa matrices) are considered. In these schemes neutrino transitions are virtual if neutrino masses are different. Two of them belong to the so called mass mixing schemes (mixing parameters are expressed by elements of mass matrices) and the third scheme belongs to the charge mixing scheme (mixing parameters are expressed through charges). In the first scheme system of 6 equations for determination of the all elements of the mass matrix (neutrino masses and transition widths) by using experimental data are obtained. In the second and third ones the neutrino mixing angles are equal or close to maximal angles ($\pi/4$). It is obvious that the experiment must give an answer to the following question: Which of these schemes is realized indeed? 
Kh. M. Beshtoev