Bottomonium spectrum with a Dirac potential model in the momentum space David Molina, Maurizio De Sanctis, César Fernández-Ramírez and Elena Santopinto Eur. Phys. J. C, 80 6 (2020) 526 Published online: 12 June 2020 DOI: 10.1140/epjc/s10052-020-8099-z