2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/183930In this talk I show how considering at the same time the $ν_e \to ν_τ$ and the $ν_e \to ν_μ$ oscillation channels the errors in the leptonic CP-violating phase $δ$ measurement could significantly be reduced.3 pages, 1 eps fig, 2 ps fig, talk presented at NuFact02, London 1-6 July 2002High Energy Physics - Phenomenologytext