2183-3575 2183-3575 S2183-35752021000100007 10.17231/comsoc.39(2021).3431 Portugal Singapura 30 06 2021 30 06 2021 39 7 14 2020 10 6 6 395-406 2021 2021 280 2020 55 115 115 53-60 2020 31 31 191-213