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Higuchi R, Bowman B, Freiberger M, Ryder OA, Wilson AC (1984). "DNA sequences from the quagga, an extinct member of the horse family". Nature312 (5991): 282–4. PMID6504142. doi:10.1038/312282a0.
Wirth R, Friesenegger A, Fiedler S (March 1989). "Transformation of various species of gram-negative bacteria belonging to 11 different genera by electroporation". Mol. Gen. Genet.216 (1): 175–7. PMID2659971. doi:10.1007/BF00332248.
Chang MH, Chen CJ, Lai MS, et al. (June 1997). "Universal hepatitis B vaccination in Taiwan and the incidence of hepatocellular carcinoma in children. Taiwan Childhood Hepatoma Study Group". N. Engl. J. Med.336 (26): 1855–9. PMID9197213. doi:10.1056/NEJM199706263362602.