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The 5 references without a DOI — listed, not checked
no DOI — not checkedS. M. Johnson, “Ultra high temperature ceramics (UHTCs),” in Proceedings of the Thermal Protection System Technical Interchange Meeting
(TPS TIM) (Moffett Field, 2015), pp. 1–65. https://ntrs.nasa.gov/ archive/nasa/casi.ntrs.nasa.gov/20150022996.pdf
no DOI — not checkedA. N. Astapov, E. A. Levashov, I. P. Lifanov, Yu. S. Pogozhev, A. Yu. Potanin, M. V. Prokofiev, and L. N. Rabinskiy, “Heterophase materials in the ZrSi2–ZrB2–MoSi2 system: synthesis, kinetics, and oxidation mechanisms,” in Proceedings of the XXIV International Symposium named after A. G. Gorshkov on Dynamic and Technological Problems of Structures and Continuums (Moscow, OOO TRP, 2018), Vol. 1, pp. 7–9. https://elibrary.ru/item.asp?id=35008652
no DOI — not checkedI. P. Lifanov and A. N. Astapov, “Study of the kinetics and mechanism of ceramic oxidation in the ZrSi2–MoSi2–ZrB2 system at 1650°C in air,” in Youth and Future of Aviation and Cosmonautics (Collection of Abstracts of Competitive Works of the X All-Russia Inter-Industry Youth Competition of Scientific Technical Works and Projects) (Moscow, 2018), pp. 294–296. http://mforum.mai.ru/files/Cбopник_2018.pdf
no DOI — not checkedZ. Zheng, P. Zhou, H. Zhao, X. Liu, and B. Liu, “Research on ZrSi2–SiC/SiC anti-oxidation coating on HTR graphite spheres,” Trans. Am. Nucl. Soc. 117, 608–612 (2017).
no DOI — not checkedFACT (Facility for the Analysis of Chemical Thermodynamics). http://www.crct.polymtl.ca/FACT/
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