| References: |
- Deposit:: DUKE, V. W. A., 1979, MANGANESE, A MINERAL COMMODITY REVIEW: INTERNAL REPORT 53, SOUTH AFRICAN MINERALS BUREAU, JOHANNESBURG, SOUTH AFRICA, P. 116-117.
- Deposit:: NATIONAL MATERIALS ADVISORY BOARD, 1981, MANGANESE RESERVES AND RESOURCES OF THE WORLD AND THEIR INDUSTRIAL IMPLICATIONS: NMAB-374, NATIONAL ACADEMY OF SCIENCES, WASHINGTON, DC, P. 32-33, 115-117. (RR1, RR17-RR18, PA1-PA3, PC1)
- Deposit:: INTERNATIONAL ASSOCIATION ON THE GENESIS OF ORE DEPOSITS, 1974, TWELVE ORE DEPOSITS OF BULGARIA: 4TH SYMPOSIUM, VARNA, SOFIA, P. 149-160.
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