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  • 1
    Parker PM. The 2007–2012 World Outlook for Wood Toilet Seats. Icon Group International Inc. May 2006. Available at http://www.marketresearch.com
  • 2
    Siddiqi H. The social norm of leaving the toilet seat down: A game theoretic analysis. MPRA Paper No. 856, November 2007. Available at http://mpra.ub.uni-muenchen.de