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References
- ↑ Crilly, Tony (2007). 50 Mathematical Ideas you really need to know. London: Quercus. p. 132. ISBN 978-1-84724-008-8.
- ↑ "Von Guericke, Otto". Encyclopædia Britannica . Vol. 9 (11th ed.). The Encyclopædia Britannica Co. 1910. p. 670.