%0 Journal Article %A P. G. Grinevich %A P. M. Santini %T An~integral geometry lemma~and its applications: The~nonlocality of the~Pavlov equation and a~tomographic problem with opaque parabolic objects %J Teoretičeskaâ i matematičeskaâ fizika %D 2016 %P 59-68 %V 189 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_2016_189_1_a4/ %G ru %F TMF_2016_189_1_a4