Ruppeiner geometry and thermodynamic phase transition of the black hole in massive gravity Bin Wu, Chao Wang, Zhen-Ming Xu and Wen-Li Yang Eur. Phys. J. C, 81 7 (2021) 626 Published online: 18 July 2021 DOI: 10.1140/epjc/s10052-021-09407-y