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Phillip Matier and Andrew Ross, «Low-Flow Toilets Cause a Stink in SF», San Francisco Chronicle, February 28, 2011, p. C-1. http://www.sfgate.com/cgi-bin/article.cgi?f=/с/а/2011/02/27/BAVP1HUSUD.DTL#ixzzlvABOKpfS.