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The manifestations of QCD effects on quark and gluon distribution functionsof longitudinally polarized virtual photons involved in hard collisions areinvestigated. It is shown that for moderate photon virtualities and in thekinematical region accessible at HERA and LEP these effects are sizable andsignificantly enhance theoretical predictions based on contributions oftransversally polarized virtual photon only.Comment: 7 pages, Latex using EPJ style, 8 eps figure

Resolved $\gamma^*_L$ in hard collisions of virtual photons: QCD effects