1. Cataldo, A., et al.: Design of a single window system for e-government services: the chilean case. J. Ind. Manag. Optim. 14(2), 561–582 (2017)
2. United Nations: United Nations E-Government Survey 2016. In: E-Government in Support of Sustainable Dvelopemnt. United Nations, New York (2016)
3. Gil-Garcia, J.R., Vargas-Marin, E., Gascó, M.: Understanding the success of government portals: the role of political leadership, standards, and a powerful centralized IT agency. In: Proceedings of the 51st Hawaii International Conference on System Sciences (2018)
4. Sá, F., Rocha, Á., Cota, M.P.: Potential dimensions for a local e-Government services quality model. Telematics Inform. 33(2), 270–276 (2016)
5. Peters, J.C.: Web information systems: a study of maintenance, change and flexibility. Thesis. Brunel University, United Kingdom (2010)