1. Attenborough, S. J., Scarr, M. P.: The use of membrane filter techniques for control of thermophilic spores in the sugar industry. J. appl. Bact. 20, 460?466 (1957).
2. Barritt, M. M.: The intensification of the Voges-Proskauer reaction by the addition of ?-Naphthol. J. Path. Bact. 42, 441?454 (1936).
3. Bergey's Manual of determinative bacteriology, 7th ed. Baltimore: Williams and Wilkins Comp. 1957.
4. Cameron, E. J.: Detecting and estimating numbers of thermopylic bacteria in sugars. Jl. Ass. Off. Agric. Chem. 19, 438?440 (1936); cit. Int. Sugar J. 39, 71?72 (1937).
5. Campbell, L. L., Postgate, J. R.: Classification of the spore-forming, sulfate-reducing bacteria. Bact. Rev. 29, 359?363 (1965).