Importance of confinement in instanton induced potential for bottomonium spectroscopy Bhoomika Pandya, Manan Shah and P. C. Vinodkumar Eur. Phys. J. C, 81 2 (2021) 116 Published online: 03 February 2021 DOI: 10.1140/epjc/s10052-021-08901-7