@misc{ine2020porto, title = {Porto Metropolitan Area Gross Value Added per NACE codes} author = {INE}, url = {https://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ine_indicadores&userLoadSave=Load&userTableOrder=9964&tipoSeleccao=0&contexto=pq&selTab=tab1&submitLoad=true&xlang=pt}, year = {2020} }