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到。而《亚瑟王之死》将两个说法都写入从而产生两把剑。因此Excalibur和石中剑系屬同源。有观点认为“石中拔出剑”是在暗指冶金术。 Robert de Boron. [2007-09-16]. （原始内容存档于2008-03-15）. Merlin: roman du XIIIe siècle
2001，第931頁. van Setten M.J., Uijttewaal M.A., de Wijs G.A., de Groot R.A. Thermodynamic stability of boron: The role of defects and zero point motion. J
Brahim Khater, Jean-Claude Guillemin. The Ever-Surprising Chemistry of Boron: Enhanced Acidity of Phosphine⋅Boranes. Chemistry - A European Journal.
of Propulsion and Power, v 11, no 2. The authors describe the proton — Boron 11 reaction and its application to ionic electrostatic confinement. R. W
Rademacher, P.; Heymanns, P. Structure and electronic nature of the benzaldehyde/boron trifluoride adduct. Journal of the American Chemical Society. 1986-04, 108