Piraux, L., Issi, JP., Mareche, JF., & Mcrae, E. (1989). Stage Dependence of the Extra Phonon Contribution To the Thermal-conductivity of Graphite-intercalation Compounds. Synthetic Metals, 30(2), 245-249. https://doi.org/10.1016/0379-6779(89)90793-5 (Original work published 1989)