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Busse, Ingo (2018. április 14.). „Systematics of primary osmotrophic euglenids: a molecular approach to the phylogeny of Distigma and Astasia (Euglenozoa)”. International Journal of Systematic and Evolutionary Microbiology53 (2), 617–624. o. DOI:10.1099/ijs.0.02295-0. PMID12710635.