Curing the unphysical behaviour of NLO quarkonium production at the LHC and its relevance to constrain the gluon PDF at low scalesJean-Philippe Lansberg and Melih A. OzcelikEur. Phys. J. C, 81 6 (2021) 497DOI: https://doi.org/10.1140/epjc/s10052-021-09258-7