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Sweden | |
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| Dobbe, R. T. M. (1991) Ullmannite, cobaltian ullmannite and willyamite from Tunaberg, Bergslagen, central Sweden. The Canadian Mineralogist, 29 (2) 199-205 |
| Dobbe, R. T. M., Lustenhouwer, W., Zakrzewski, M. A. (1994) Kieftite, CoSb3, a new member of the Skutterudite group from Tunaberg, Sweden. The Canadian Mineralogist, 32 (1) 179-183 |
| Natural History Museum Stockholm collection, inventory nr. g03796 |