NMR evidence for the charge transfer from interstitial NO or O2 to molecule C60 in solid C60 M. Gu, S. Wang, J. Wu, D. Feng and W. Xu Eur. Phys. J. D, 34 1-3 (2005) 97-100 Published online: 13 July 2005 DOI: 10.1140/epjd/e2005-00127-4