Webgrafia

https://ca.wikipedia.org/wiki/Castell_de_Pallej%C3%A0

 http://www.palleja.cat/ajpalleja/cas/?tit=El%20Castell&ref=castell

http://fichas.infojardin.com/arbustos/pittosporum-tobira-pitosporo-azahar-de-china.htm

http://smartcity.bcn.cat/

http://www.smartcityexpo.com/ca/

https://ca.wikipedia.org/wiki/Activitat_f%C3%ADsica

https://ca.wikipedia.org/wiki/Energia_renovable

https://www.youtube.com/results?search_query=que+es+una+smart+city