%0 Journal Article %T Congratulations to Igor Vasil'evich Volovich and Vladimir Leonidovich Popov %J Izvestiya. Mathematics %D 2016 %P 995 %V 80 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2016_80_6_a0/ %G en %F IM2_2016_80_6_a0