1. 1. Horikoshi, K.: Superbugs. In Horikoshi, K. and Grant, D. (ed.). Japan Scientific Societies Press, Tokyo (1991).
2. 2. Oshima, T.: Thermophiles: general molecular and applied microbiology. In Brock, T.D. (ed.). John Wiley and Sons, New York (1986).
3. 3. Horikoshi, K. and Akiba, T.: Alkalophilic microorganisms. Japan Scientific Societies Press, Tokyo (1982).
4. Acidiphilium cryptum gen. nov., sp. nov., Heterotrophic Bacterium From Acidic Mineral Environments
5. Acidophilic heterotrophic bacteria isolated from acidic mine drainage, sewage, and soils.