Christmann, M (2010). «Otto Wallach: Founder of Terpene Chemistry and Nobel Laureate 1910». Angewandte Chemie International Edition49 (50): 9580–9586. doi:10.1002/anie.201003155. PMID21110354.
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Christmann, M (2010). «Otto Wallach: Founder of Terpene Chemistry and Nobel Laureate 1910». Angewandte Chemie International Edition49 (50): 9580–9586. doi:10.1002/anie.201003155. PMID21110354.