Bernd and Hilla Becher

http://www.artnet.com/Artists/ArtistHomePage.aspx?artist_id=2179&page_tab=Artworks_for_sale

http://www.tate.org.uk/research/tateresearch/tatepapers/04spring/stimson_paper.htm

http://en.wikipedia.org/wiki/Bernd_and_Hilla_Becher

https://www.theguardian.com/artanddesign/2014/sep/03/bernd-and-hilla-becher-cataloguing-the-ominous-sculptural-forms-of-industrial-architecture

http://www.getty.edu/art/collection/artists/1777/bernd-and-hilla-becher-german-partnership-1959-2007/