Martínez, A., and J. Mirás Araujo. “Cooperative Firms and Nymbi Syndrome: The Case of Engasa,1981-2008”. Revista De Historia Industrial — Industrial History Review, vol. 19, no. 44, Dec. 2017, pp. 139-65, https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/20728.