TY - JOUR AU - P. G. Grinevich AU - P. M. Santini TI - An~integral geometry lemma~and its applications: The~nonlocality of the~Pavlov equation and a~tomographic problem with opaque parabolic objects JO - Teoretičeskaâ i matematičeskaâ fizika PY - 2016 SP - 59 EP - 68 VL - 189 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_2016_189_1_a4/ LA - ru ID - TMF_2016_189_1_a4 ER -