Nikulina, Y. N., T. V. Yurchenko, and V. N. Surovtsev. ’Rural Population Dependence on the Level of Agricultural Development: Panel Data Analysis of Leningrad Oblast’. Population, Vol. 24, no. 1, Mar. 2021, pp. 90-2, doi:https://doi.org/10.19181/population.2021.24.1.9.