By Böing H.   Koepf W.   in Journal of Symbolic Computation

ISSN:0747-7171|28|6|777-799

Academic Press‎(1999)‎

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By Becker J.   Correll A.   Koepf W.   Rittner C.   in Journal of Analytical Toxicology

ISSN:0146-4760|17|2|103-108

Oxford University Press‎(1993)‎

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