The Dokshitzer–Gribov–Lipatov–Altarelli–Parisi (DGLAP) evolution equations are equations in QCD describing the variation of parton distribution functions with varying energy scales.
[1] Experimentally observed scaling violation in deep inelastic scattering is important evidence for the correctness of the equations and of QCD in general.
[2] Only later did it become known that an equivalent formula had been published in Russia by Yuri Dokshitzer [de] in 1977,[3] and by Vladimir Gribov and Lev Lipatov in 1972.
[4] The DGLAP QCD evolution equations are widely used in global determinations of parton distributions, like those from the CTEQ or NNPDF collaborations.
"Proton Structure, Partons, QCD, DGLAP and Beyond" (PDF).