%0 Journal Article %T "Solidarity" as a basis for the sustainability of the compulsory pension insurance system: constitutional-legal and financial-legal aspects %A Ivanyuzhenko, A.B. %K insurance pension, demographic transition, biological species, the right to abortion, constitutional principles, childlessness, solidarity, stimulation of childbearing, legal obligation %J Journal of Legal Studies %D 2025 %N 10 %P 15 %I INFRA-M Academic Publishing LLC.