We study the effects of the perturbation which violates the permutation symmetry of three Majorana neutrinos but preserves the well known (23) interchange symmetry. This is done in the presence of an arbitrary Majorana phase which serves to insure the degeneracy of the three neutrinos at the unperturbed level.
Schechter, Joseph; Jora, Renata; and Shahid, M. Naeem, "Perturbed S3 Neutrinos" (2009). Physics. 254.
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