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Intelligent Bathroom Fixtures and Systems (comparison between passive and active vision systems for use with plumbing fixtures, as published in Leonardo, 36(3), pp 199–120, June 2003)

A Brief history of Wells and Toilets , 2005 book (link to pdf-file)

Did Thomas Crapper invent the flush toilet? - at Snopes

"Superflushing their way to the Super Bowl" - PM Engineer

Exploding toilets prompt recall, lawsuit