Electric transitions of the charmed-strange mesons in a relativistic quark model Shao-Feng Chen, Jing Liu, Hai-Qing Zhou and Dian-Yong Chen Eur. Phys. J. C, 80 3 (2020) 290 Published online: 31 March 2020 DOI: 10.1140/epjc/s10052-020-7852-7