References for Johannes Tetens

  1. Biography in Encyclopaedia Britannica.
    http://www.britannica.com/EBchecked/topic/588869/Johannes-Nikolaus-Tetens

Articles:

  1. N Keiding, The method of expected number of deaths, 1786-1886-1986, Internat. Statist. Rev. 55 (1) (1987), 1-20.

July 2007

MacTutor History of Mathematics
[http://www-history.mcs.st-andrews.ac.uk/References/Tetens.html]