TY - JOUR AU - Xie, Rui-Hua AU - Bryant, Garnett W. AU - Sun, G AU - Nicklaus, M AU - Smith, V AU - Araki, Y AU - Ito, O C2 - Journal of Chemical Physics DA - 2008-10-16 14:10:14 LA - en M1 - 120 PB - Journal of Chemical Physics PY - 2008 TI - Excitations, Optical Absorption Spectra, and Optical Excitonic Gaps of Heterofullerenes: I. C60, C59N+ and C48N12 ER -