Search for Lepton-Flavor Violating Decays B^{+}→K^{+}μ^{±}e^{∓}. - Aaij R; Abellán Beteta C; Ackernley T; Adeva B; Adinolfi M; Aidala CA; Ajaltouni Z; Akar S; Albicocco P; Albrecht J; Alessio F; Alexander M; et al. (Physical review letters, 2019)