References for Theodosius

1. I Bulmer-Thomas, Biography in Dictionary of Scientific Biography (New York 1970-1990).
   http://www.encyclopedia.com/doc/1G2-2830904281.html

Books:

2. T L Heath, A History of Greek Mathematics (2 Vols.) (Oxford, 1921).
3. O Neugebauer, A history of ancient mathematical astronomy (New York, 1975).
4. J Tropike, Geschichte der Elementar-Mathematik V (Berlin, 1923).

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http://www-history.mcs.st-andrews.ac.uk/References/Theodosius.html