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Published online by Cambridge University Press: 19 July 2016
Beginning in 1980, the fluxes of over 40 bright quasars, BL Lacs and Seyferts have been monitored at radio and optical wavelengths in a Finnish-Soviet collaboration. The chief aims of the program are to provide information about the variability characteristics of active nuclei over a wide range of timescales and to fill a gap in monitoring programs at millimeter wavelengths. The results are also used as a basis for various other investigations.