1. Nguyen, T.: Socio-economic zoning: linking for mutual development. Economy and Cities. The Speech Department of the Hanoi People's Committee, 2020. https://kinhtedothi.vn/phan-vung-kinh-te-xa-hoi-lien-ket-de-cung-phat-trien.html
2. Anh, N.X.: Socio-economic zoning and the problem of awakening the development potential of the locality (2021). https://nguoidothi.net.vn/phan-vung-kinh-te-xa-hoi-va-bai-toan-danh-thuc-tiem-luc-phat-trien-cua-dia-phuong-29983.html
3. Anh, T.H.: Classification the country into 7 regions: inheriting the existing plan or renewing it? https://nguoidothi.net.vn/chia-ca-nuoc-thanh-7-vung-ke-thua-quy-hoach-da-co-hay-lam-moi-24069.html
4. Shalymov, D.S.: Stable clustering algorithms based on index functions and stability functions. Intelligent subsystems of CAD: MSTU im, pp. 236–248. N.E. Bauman (2008)
5. Volkova, V.N., Gorelova, G.V., Kozlov, V.N., Lypar, Y.I., Paklin, N.B., Firsov, A.N., Chernenkaya, L.V.: Systems modeling. In: Volkova, V.N. (ed.) Approaches and Methods: Textbook, 567 pp. Publishing House of the Polytechnic University, St. Petersburg (2013)