Author: Russia) Vsesoi︠u︡znai︠a︡ nauchno-tekhnicheskai︠a︡ konferent︠s︡ii︠a︡ po primenenii︠u︡ radioaktivnykh i stabilʹnykh izotopov i izlucheniĭ v narodnom khozi︠a︡ĭstve i nauke (2nd 1957 Moscow