On rational homotopy theory of non-nilpotent spaces via deck-Borel-equivariant rational homotopy theory of their universal covering spaces: Antonio Gómez-Tato, Stephen Halperin, Daniel Tanré: Rational homotopy theory for non-simply connected spaces, Trans. Amer. Math. Soc. 352 (2000) 1493–1525 [jstor:118074, doi:10.1090/S0002-9947-99-02463-0] Urtzi Buijs, Yves Félix, Aniceto Murillo, Daniel Tanré, Homotopy theory of complete Lie algebras and Lie models of simplicial sets, Journal of Topology...