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A special form of the $3 \times 3$ Majorana neutrino mass matrix derivable from $\mu - \tau$ interchange symmetry accompanied by a generalized $CP$ transformation was obtained many years ago.
D. Wyler and L. Wolfenstein, Nucl. Phys. B218
1983
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R. N. Mohapatra and J. W. F. Valle, Phys. Rev. D34
1986
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E. Ma, Phys. Lett. B191
1987
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E. Ma, Phys. Rev. Lett. 81
1998
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E. Ma, Phys. Rev. D66
2002
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K. S. Babu, E. Ma, and J. W. F. Valle, Phys. Lett. B552
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W. Grimus and L. Lavoura, Phys. Lett. B579
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S. Fraser, E. Ma, and O. Popov, Phys. Lett. B737
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Particle Data Group, K. A. Olive et al
2014
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