I would like to conduct research about disclosure of sustainability information in local governments in Brazil, Spain and Portugal. Could you contribute with this research? Thank you.
Fedotova, Olga, Leonor Teixeira, and Helena Alvelos. "E-participation in Portugal: evaluation of government electronic platforms." Procedia Technology 5 (2012): 152-161.
Saragoça, José. "Governo Electrónico Local: Diagnóstico Sociológico, Estratégia de Actores e Futuros Possíveis para o Distrito de Évora, Portugal." (2011).
de Morais, Lígia Esgalhado. E-Gov em Cabo Verde: análise do impacto do Governo Electrónico na população Cabo-Verdiana. Diss. ISCTE-IUL, 2010.
I guess you need to define sustainability information to get to the second step. Once it is defined, you can pursue the topic. I would suspect the articles provided by Nuno are relevant (the English one at least