Self-employment of Russian population in the second half of the 1980s: the case of the Black Earth Region
... Индивидуальная трудовая деятельность : сб. норм. актов / сост. и авт. предисл. В. В. Трынков. М., 1989.
8. ГАОПИ ВО. Ф.3. Оп. 89. Д. 71.
Pertsev V.
self-employment, Perestroika processes, Black Earth economic region, personal services
113-118