Trudy XXVI Chteniĭ, posvi͡a︡shchennykh razrabotke nauchnogo nasledii͡a︡ i razvitii͡u︡ ideĭ K.Ė. T͡S︡iolkovskogo, Kaluga, 17-20 senti͡a︡bri͡a︡ 1991 g | lit.salon