Ivanov, Sergeĭ Ivanovich doktor ėkonomicheskikh nauk, Leningradskiĭ gosudarstvennyĭ pedagogicheskiĭ institut imeni A.I. Gert︠s︡ena, Gertsenovskie chteniia (mezhvuzovskaia konferentsiia) 25th Leningrad 1972