We would like to point to the strong violation of the putative factorized
Pomeron exchange model in the reactions γγ→VV′ in the
high-energy region where this model works fairly well in all other cases.Comment: 4 pages, LaTex, 1 fig. in postscript, minor typos corrected, to be
published in Phys. Rev. D 60, 117503 (1999