By Longenecker J.   Witzel R.   in Fuel and Energy Abstracts

ISSN:0140-6701|37|6|430-430

Elsevier‎(1996)‎

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By Hermentin P.   Witzel R.   in Pharmacy and Pharmacology Communications

ISSN:1460-8081|5|1|33-43

Pharmaceutical Press‎(1999)‎

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