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Edgeworth, R.; Dalton, B.J.; Parnell, T. "The Pitch Drop Experiment". The University of Queensland Australia. Archived from the original on 28 March 2013. Retrieved 15 October 2007.
"The Pitch Drop Experiment". The University of Queensland Australia: School of Mathematics and Physics. 6 January 2016. Archived from the original on 15 June 2020. Retrieved 17 August 2016.