Non-quadratic improved Hessian PDF reweighting and application to CMS dijet measurements at 5.02 TeV Kari J. Eskola, Petja Paakkinen and Hannu Paukkunen Eur. Phys. J. C, 79 6 (2019) 511 Published online: 15 June 2019 DOI: 10.1140/epjc/s10052-019-6982-2