1. Baars, J. K., Over sulfaatreductie door bacterien, p. 1?164. Dissertation, Delft, 1930.
2. Barr, W. M. and Buchanan, R. E., Iowa State Col. Engin. Exper. Station, Bull. 26, 1912.
3. Bastin, E. S., Bull. Amer. Assoc. Petroleum Geologists 10, 1270, 1926.
4. Bastin, E. S., J. Geol. 34, 773, 1926.
5. Beijerinck, M. W., Centralbl. f. Bakt. II, 1, 1, 49, 104, 1895.