NMR study of non-equilibrium state of fullerene C60 in N-methyl-2-pyrrolidone - O. B. Karpenko; V. V. Trachevskij; O. V. Filonenko; V. V. Lobanov; M. V. Avdeev; T. V. Tropin; O. A. Kyzyma; S. V. Snegir (Ukrainian journal of physics, 2012)