Search for a nearly degenerate lepton doublet (L-,L0). - Riles K; Perl ML; Barklow T; Boyarski A; Burchat PR; Burke DL; Dorfan JM; Feldman GJ; Gladney L; Hanson G; Hayes K; Hollebeek RJ; et al. (Physical review. D, Particles and fields, 1990)