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HITZ HR, 1978, JSDC, P71
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PAGGA U, 1985, Z WASSER ABWASS FOR, V18, P222
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PAGGA U, 1981, WATER SCI TECHNOL, V13, P233
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PAGGA U, 1982, VOM WASSER, V59, P51
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SCHONHOLZ W, 1989, THESIS FACHHOCHSCHUL
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1991, ISO9888 INT STAND
[9]
1986, ISO8192 INT STAND
[10]
1979, OECD GUIDELINES TEST