Shulga, M. A., D. V. Nelipa, V. Y. Vorotin, N. M. Korchak, and K. O. Vashchenko. “When Does the State Disappear? (in Memory of Rudolf Kjellen)”. Linguistics and Culture Review, vol. 5, no. S2, Aug. 2021, pp. 795-04, doi:10.21744/lingcure.v5nS2.1421.