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Bulgaria | |
| McCoyd, R. J. (1995). Isotopic and geochemical studies of the epithermal-mesothermal Pb-Zn deposits of SE Bulgaria (Doctoral dissertation, University of Aberdeen). |
| Vassileva, R. D., Atanassova, R., & Bonev, I. K. (2009). A review of the morphological varieties of ore bodies in the Madan Pb-Zn deposits, Central Rhodopes, Bulgaria. Geochem Mineral Petrol, 47, 31-49. |
| Bonev, I.K. (1993) Non-equilibrium highly anisometric crystals and whiskers of galena. Mineralogical Magazine, 57 (issue 387), 231-240. |