Heremans, J., Issi, JP., Zabalamartinez, I., Shayegan, M., & Dresselhaus, MS. (1981). Thermoelectric Properties of a Dilute Graphite Donor Intercalation Compound. Physics Letters. Section A: General, Atomic and Solid State Physics, 84(7), 387-389. https://doi.org/10.1016/0375-9601(81)90217-6 (Original work published 1981)