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nih.gov
ncbi.nlm.nih.gov
(en) Tsokolov, Serhiy A. (2009). Why Is the Definition of Life So Elusive? Epistemological Considerations. Astrobiology9 (4): 401–12. PMID19519215. DOI: 10.1089/ast.2007.0201.
(en) Budisa N, Kubyshkin V, Schmidt M. (2020). Xenobiology: A Journey towards Parallel Life Forms. ChemBioChem21 (16): 2228–2231. PMID32323410. DOI: 10.1002/cbic.202000141.
(en) Koonin EV, Senkevich TG, Dolja VV. (2006). The ancient Virus World and evolution of cells. Biology Direct1. PMID16984643. DOI: 10.1186/1745-6150-1-29.
(en) Woese, C.R., Kandler, O. & Wheelis, M.L. (1990). Towards a natural system of organisms: proposal for the domains Archaea, Bacteria, and Eucarya. Proceedings of the National Academy of Sciences of the United States of America87 (12): 4576–9. PMID2112744. PMC54159. DOI: 10.1073/pnas.87.12.4576.