Remarks on the heavy-quark flavour symmetry for doubly heavy hadronic moleculesV. Baru, E. Epelbaum, J. Gegelia, C. Hanhart, U.-G. Meißner and A. V. NefedievEur. Phys. J. C, 79 1 (2019) 46DOI: https://doi.org/10.1140/epjc/s10052-019-6560-7