Composite models of leptons

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Abstract
We give ten criteria for composite models of leptons, and present two models which satisfy a number of these criteria. Both models use three triplets of leptonic analogs of quarks which we call "leptoquarks"; the first model uses fractionally charged leptoquarks and the second model uses integrally charged ones. In the second model, leptoquarks and quarks could be identical and there is a possibility of unifying the description of leptonic and hadronic phenomena. Both models assign leptons to nonsinglet representations of SU(3)". A plausible SU(3)" mass formula allows the known leptons to be less massive than baryons if leptoquarks and quarks are identical.