Montalti, M., Krishnamurthy, S., Chao, Y., Butenko, Y., Kuznetsov, V., Dhanak, V., …Šiller, L. (2003). Photoemission spectroscopy of clean and potassium-intercalated carbon onions. Physical review B, 67(11), https://doi.org/10.1103/physrevb.67.113401