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In this paper the experiences concerning the organisation and results of the enchytraeid reproduction test (ERT) ringtest are summarised (for details see J. Rombke, T. Moser, Organisation and Performance of an International Ringtest for the Validation of the Enchytraeid Reproduction Test, vols. I and II. UBA-Texte 4/99, 1999, 150, 223 pp).* The performance of this ringtest was in line with requirements...
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