Title: Trudy letneĭ shkoly po spektralʹnoĭ teorii operatorov i teorii predstavlenii︠a︡ grupp (Baku, Zagulʹba, 15 mai︠a︡-3 ii︠u︡ni︠a︡ 1968 g.)
Subjects: Differential operators, Operator theory, Physics, Congresses