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4. Twort, F. W. An investigation on the nature of ultra-microscopic viruses. Lancet 2, 1241–1243 (1915). This paper presents the original discovery of bacterial viruses.
5. d'Herelle, F. The Bacteriophage and its Behavior 490–541 (Williams & Wilkins, Baltimore, Maryland, 1926). Although much of the material in this book is dated, it still contains observations of interest.