By Hübner T.   Tischer S.   Tanneberg H.   Kuschk P.   in International Journal of Phytoremediation

ISSN:1522-6514|2|4|331-342

Taylor & Francis Ltd‎(2000)‎

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By de Simone C.   Oka E.R.   Tischer S.   in Contemporary Educational Psychology

ISSN:0361-476X|24|1|55-69

Academic Press‎(1999)‎

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