Saunders, M.; Jimenez-Vazquez, H. A.; Cross, R. J.; Mroczkowski, S.; Gross, M. L.; E. Giblin, D.; Poreda, R. J. (1994). “Incorporation of helium, neon, argon, krypton, and xenon into fullerenes using high pressure”. J. Am. Chem. Soc.116 (5): 2193–2194. doi:10.1021/ja00084a089.