By Shayler Hannah A.   Siver Peter A.   in Nova Hedwigia

ISSN:0029-5035|78|3-4|399-409

E. Schweizerbart'sche Verlagsbuchhandlung‎(2004)‎

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By Shayler Hannah   Siver Peter   in Journal of Science Education and Technology

ISSN:1059-0145|15|3-4|298-303

Springer Publishing Company ‎(2006)‎

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