References/Notes/Attributions:
Source
Guy, W. A. 1882. Two hundred and fifty years of small pox in London. Journal of the Royal Statistical Society 399-443.
Stocks, P. 1942. Measles and whooping cough during the dispersal of 1939-1940. Journal of the Royal Statistical Society 105:259-291.
References
Lancaster, H. O. 1990. Expectations of Life. Springer.