Aaij, R Observation of D^ Meson Decays to π^π^μ^μ^ and K^K^μ^μ^ Final States. [electronic resource] - Physical review letters Nov 2017 - 181805 p. digital Publication Type: Journal Article ISSN: 1079-7114 Standard No.: 10.1103/PhysRevLett.119.181805 doi