Author: Vsesoi︠u︡znai︠a︡ nauchnai︠a︡ studencheskai︠a︡ konferent︠s︡ii︠a︡ "Student i nauchno-tekhnicheskiĭ progress" (19th 1981 Novosibirskiĭ gosudarstvennyĭ universitet im. Leninskogo komsomola)