- Ross R., ‘The Mathematics of Malaria’, The British Medical
 Journal, 1911.
- Reiter P., ‘From Shakespeare to Defoe: Malaria in England in
 the Little Ice Age’, Emerging Infectious Diseases, 2000.
- McKendrick background from: Gani J., ‘Anderson Gray
 McKendrick’, StatProb: The Encyclopedia Sponsored by
 Statistics and Probability Societies.
- Letter GB 0809 Ross/106/28/60. Courtesy, Library & Archives
 Service, London School of Hygiene & Tropical Medicine. © Ross
 Family.
- Letter GB 0809 Ross/106/28/112. Courtesy, Library & Archives
 Service, London School of Hygiene & Tropical Medicine. © Ross
 Family.
- Heesterbeek J.A., ‘A Brief History of R0 and a Recipe for its
 Calculation’, Acta Biotheoretica, 2002.
- Kermack background from: Davidson J.N., ‘William Ogilvy
 Kermack’, Biographical Memoirs of Fellows of the Royal Society,
 1971; Coutinho S.C., ‘A lost chapter in the pre-history of
 algebraic analysis: Whittaker on contact transformations’, Archive
 for History of Exact Sciences, 2010.
- Kermack W.O. and McKendrick A.G., ‘A Contribution to the
 Mathematical Theory of Epidemics’, Proceedings of the Royal
 Society A, 1927.
- Fine P.E.M., ‘Herd Immunity: History, Theory, Practice’,
 Epidemiologic Reviews, 1993; Farewell V. and Johnson T., ‘Major
 Greenwood (1880–1949): a biographical and bibliographical
 study’, Statistics in Medicine, 2015.
- Dudley S.F., ‘Herds and Individuals’, Public Health, 1928.
- Hendrix K.S. et al., ‘Ethics and Childhood Vaccination Policy in
 the United States’, American Journal of Public Health, 2016.
                    
                      greg delong
                      (Greg DeLong)
                      
                    
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