1. Beijerinck, M. W., Centralbl. f. Bakt. II, 7, 52 1901.
2. Bergey, D. H. et al., Manual of Determ. Bact. 4 Ed. London, 1934.
3. Ellis, D., Centralbl. f. Bakt. I. Orig., 33, 1, 81, 161, 1902.
4. Hauser, G., Deutsch. Arch. f. klin. Med. 42, 127, 1887.
5. Hucker, G. J. and L. M. Thatcher, Centralbl. f. Bakt. I. Orig., 111, 166, 1929.