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2. Minimum-Flow Plumbing Fixtures.;Siegrist;Jour. AWWA,1983
3. US Department of Housing and Urban Development Residential Water Conservation Projects. Ofce. of Policy Devel. Res. Rept. 903. Washington, D.C 1984
4. Restoration of Failing On-Site Wastewater Disposal Systems Using Water Conservation.;Sharpe;Jour. WPCF,1984
5. American Society of Mechanical Engineers Amer. Natl. Standard A112.19.2M-1982: Vitreous China Plumbing Fixtures. ANSI, New York 1982