2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132182For the GLS and Bjorken DIS sum rules we compare fixed-order NNLO perturbative QCD estimates, and all-orders resummed estimates, with the available data, in order to assess the reliability of fixed-order perturbation theory at rather small Q^2 values. Fits are also performed for non-perturbative power corrections using a recently proposed model.16 pages, 6 figuresHigh Energy Physics - Phenomenologytext