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South Korea | |
| Cheong, C. S., Jeong, G. Y., Kim, H., Choi, M. S., Lee, S. H., & Cho, M. (2003). Early Permian peak metamorphism recorded in U–Pb system of black slates from the Ogcheon metamorphic belt, South Korea, and its tectonic implication. Chemical Geology, 193(1), 81-92. |
| Tsuda, H. (1969) Supplement to "Minerals of Korea" (in: Geology and Mineral Resources of the Far East, vol. 2 (Tokyo University Press)) |