1. Arnórsson, S. (1984). Germanium in Icelandic geothermal systems. Geochimica et Cosmochimica Acta, 48, 2489–2502.
2. Asai, K. (1981). Miracle cure organic germanium. Bunkyō: Japan Publications.
3. Asaka, T., Nitta, E., Makifuchi, T., Shibazaki, Y., Kitamura, Y., Ohara, H., et al. (1995). Germanium intoxication with sensory ataxia. Journal of the Neurological Sciences, 130(2), 220–223.
4. Aso, H., Kobayashi, H., Sugiyama, K., Saito, K., Chiyotani, K., Ebina, T., et al. (1988). Induction of interferon and activation of NK cell and macrophages in pneumoconiotic patients after oral administration of Ge-132 (2-carboxyethylgermanium sesquioxide). The Journal of Japan Accident Medical Association, 36(3), 233–237 (in Japanese, with English summary).
5. Bachliński, R. (2002). Petrological, geochemical, and geochronological studies of crystalline rocks from the vicinity of Kudowa. Ph.D. thesis, Institute of Geological Sciences, Warsaw. (in Polish).