Observation of the Decay D^{0}→K^{-}π^{+}e^{+}e^{-}. - Lees JP; Poireau V; Tisserand V; Grauges E; Palano A; Eigen G; Brown DN; Kolomensky YG; Fritsch M; Koch H; Schroeder T; Hearty C; et al. (Physical review letters, 2019)