Modeling the Impact of Knowledge Management on the Sustainability of Economic Institutions: An Analytical Study of Employees’ Perceptions in CNAS, CASNOS, and CNAC Institutions across the Provinces of El Oued, Biskra, and Ouargla, Algeria. (2026). Lex Localis - Journal of Local Self-Government, 396-402. https://doi.org/10.52152/ddjdff39