1. Aristotle 1a, On the Generation and Corruption, translated by H. H. Joachim, eBooks@ Adelaide 2007, I2, 315b, 25-30.
2. Aristotle 1b, ib. 316a, 25-30.
3. Aristotle 2a, Physics, translated by R. P. Hardie and R. K. Gaye, VII, 250a, 16-19.
4. Aristotle 2b, ib. VI, 241a, 5-15.
5. Boyer C.B., The Concepts of the Calculus, N. York, 1939, p. 48.