REVENGA SÁNCHEZ, Miguel. Five major challenges (and just as many threats) for constitutional democracy in the 21st century. Revista Anuario Parlamento y Constitución, [S. l.], n. 12, p. 25–44, 2009. DOI: 10.71206/rapc.199. Disponível em: https://parlamentoyconstitucion.cortesclm.es/rapc/article/view/199. Acesso em: 9 nov. 2026.