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Chemie der ätherischen Öle allgemein: ResearchGate, Chemistry of Essential Oils and Factors Influencing Their Constituents; Aromatic Wisdom Institute, Ten Essential Oil Chemical Families Kritik an der Functional Group Theory: Tisserand Institute, Functional Group Theory, Does it Work? (peer-reviewter Fachartikel); Tisserand & Young, Essential Oil Safety Phototoxizität der Zitrusöle: Tisserand Institute, Phototoxicity, essential oils, sun and safety, https://tisserandinstitute.org/phototoxicity-essential-oils-sun-and-safety/ ; CIR Safety Assessment Citrus Peel Oils ; IFRA Standard (Amendment 49), https://d3t14p1xronwr0.cloudfront.net/docs/standards/IFRA_STD_089.pdf Klinische Evidenz zur Aromatherapie: Frontiers in Public Health, Netzwerk-Meta-Analyse, https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2023.1144404/full ; VA ESP, Aromatherapy, A Map of the Evidence ; systematische Reviews (ScienceDirect S1744388123000312, S016503271933160X)