@misc{pordata2018buildings, title = {Buildings by time of construction - Porto} author = {PORDATA}, url = {https://www.pordata.pt/Municipios/Edif%c3%adcios+segundo+os+Censos+total+e+por+%c3%a9poca+de+constru%c3%a7%c3%a3o-84}, year = {2018} }