1. A A Griffith, Phil Trans Roy Soc Lond A221(1921) 163–198
2. E L Strauss, Evaluation of low cost/high temperature insulation, Martin Marietta Aerospace Report N76–11253, 1975, Denver Colorado.
3. Galileo Galilei, Dialogues concerning Two New Sciences, Elsevier Leyden 1638, Translator H Crew, McMillan Co, New York, 1914.
4. K Kendall, A J Howard, J D Birchall, Phil Trans R Soc Lond A310 (1983) 139–153
5. Vitruvius, The Ten Books of Architecture, 1st century BC, bk 7, ch 1.