Burning glass (English Wikipedia)

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Needham, Joseph. Science and Civilization in China, vol. IV, part 1: Physics and Physical Technology (PDF). p. 98. Archived from the original (PDF) on 3 July 2017. Retrieved 5 September 2016.
Needham, Joseph. Science and Civilization in China, vol. IV, part 1: Physics and Physical Technology (PDF). pp. 97–99. Archived from the original (PDF) on 3 July 2017. Retrieved 5 September 2016.
Needham, Joseph. Science and Civilization in China, vol. IV, part 1: Physics and Physical Technology (PDF). p. 99. Archived from the original (PDF) on 3 July 2017. Retrieved 5 September 2016.
"The King and Queen Mother offer fire to His Majesty the King". Radio Free Asia. Archived from the original on 2021-04-26. Retrieved 2021-04-26.
"Olympic Torch Relay history". London 2012 Olympic Games. Archived from the original on 19 July 2012. Retrieved 27 November 2012.
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