archive.org/web/20161031051955/http://www.panoramio.com/user/7351347?with_photo_id=125809323 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161029140226/http://www.panoramio.com/user/2353739?with_photo_id=94455788 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161029140212/http://www.panoramio.com/user/2353739?with_photo_id=94455780 operator: Panoramio described at URL: https://web.archive...
pdf English: RODRÍGUEZ POSADA, Emilio José; GONZÁLEZ BERDASCO, Ángel; SIERRA CANDUELA, Jorge A.; NAVARRO SANZ, Santiago; SAORÍN, Tomás (2012)...
archive.org/web/20161012112451/http://www.panoramio.com/user/2251690?with_photo_id=14992192 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161014145334/http://www.panoramio.com/user/3700753?with_photo_id=39680454 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161030122215/http://www.panoramio.com/user/1286122?with_photo_id=92557088 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161028200336/http://www.panoramio.com/user/2353739?with_photo_id=94455807 operator: Panoramio described at URL: https://web.archive...
archive.org/web/20161031232129/http://www.panoramio.com/user/3615109?with_photo_id=116903581 operator: Panoramio described at URL: https://web.archive...
English operator: Panoramio described at URL: https://web.archive.org/web/20161023065058/http://www.panoramio.com/photo/56179233...
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