Stech and Fritzsch hypotheses in the leptonic sector: Addendum to ‘‘Neutrino mass limits from the Fritzsch mass matrix.’’

Following the idea suggested by Gronau, Johnson, and Schecter we further constrain the masses of the second- and third-generation neutrinos to a very small portion of the ${\nu }_2$-${\nu }_3$ mass plane by combining the models of Fritzsch and Stech in the leptonic sector and demanding consistency with current experimental limits.