- North Chungcheong province
| Seong-Taek Yun, Chil-Sup So, Sang-Hoon Choi, Kevin L Shelton, and Ja-Hak Koo (1993) Genetic environment of germanium-bearing gold-silver vein ores from the Wolyu mine, Republic of Korea: Mineralium Deposita, 28(2), 107-121. |