Duality between different mechanisms of QCD factorization in γ * γ collisionsI. V. Anikin, I. O. Cherednikov, N. G. Stefanis and O. V. TeryaevEur. Phys. J. C, 61 3 (2009) 357-367DOI: https://doi.org/10.1140/epjc/s10052-009-1010-6