1. Glezer, O.B., Borodina, T.L., and Artobolevskii, S.S., Reform of local self-governance and administrative-territorial structure of Russian Federation subjects, Izv. Ross. Akad. Nauk, Geogr., 2008, no. 5, pp. 51–64.
2. Dubrov, A.M., Mkhitaryan, V.S., and Troshin, L.I., Mnogomernye statisticheskie metody (Multidimensional Statistical Methods), Moscow: Finan. Stat., 2011.
3. Zayonchkovskaya, Zh.A., Demograficheskaya situatsiya i rasselenie (Demographic Situation and Settlement Pattern), Moscow: Nauka, 1991.
4. Ioffe, G.V., Sel’skoe khozyaistvo Nechernozem’ya: territorial’nye problemy (Agriculture of Non-Chernozem Zone: Territorial Problems), Moscow: Nauka, 1990.
5. Kremer, N.Sh. and Putko, B.A., Ekonometrika (Econometrics), Moscow: Yunita-Dana, 2002.