Street Art 

http://www.ravishlondon.com/londonstreetart/

About the different areas of London with street art

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http://www.lexology.com/library/detail.aspx?g=24116a3b-c8ee-4c22-a9dd-c578d863bac5

Article on street art and source indication 

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http://www.widewalls.ch/defining-street-art/defining-street-art-does-not-have-a-conclusion/

About the ambiguous definition of street art 

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http://www.widewalls.ch/nature-of-street-art-long-lasting-or-ephemeral/

About the temporary nature of street art 

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http://www.theguardian.com/cities/2015/jan/07/urban-graffiti-force-good-evil

About the cultural influence and removal of street art