@misc{ine2021hectares, title = {Hectares of agricultural holdings by technical-economic orientation in Porto} author = {INE}, url = {https://www.ine.pt/xportal/xmain?xpid=INE&xpgid=ine_indicadores&indOcorrCod=0010521&contexto=bd&selTab=tab2}, year = {2021} }