We derive explicit forms for the neutrino and lepton 'mixing-matrices' which describe the generic singular see-saw model. The dependence on the hierarchy parameter is contrasted with the non-singular case. Application is made to Simpson's 17 keV neutrino.
Allen, Theodore J. Johnson, R. Ranfone, Stefano Schechter, Joseph Furtado Valle, José Wagner 1991 Simpson's neutrino and the singular seesaw Modern Physics Letters A 6 21 1967 1976
