@inproceedings{Kovalchuk:2016Pg, author = "Kovalchuk, Nataliia", title = "{Measurement of the cross-section ratio $\sigma \psi (2S)/\sigma J/\psi$ in deep inelastic exclusive ep scattering at HERA}", doi = "10.22323/1.247.0078", booktitle = "Proceedings of XXIII International Workshop on Deep-Inelastic Scattering {\textemdash} PoS(DIS2015)", year = 2016, volume = "247", pages = "078" }