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Lucas, A. A., Henrard, L., & Lambin, P. (1995). Plasmons on spherical carbon shells. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 96(3-4), 470–477. doi:10.1016/0168-583x(95)00245-6 
10.1016/0168-583x(95)00245-6