1. Heckley, R.J. 1985 Principles in preserving bacteria by freeze-drying.Developments in Industrial Microbiology 26, 379?395.
2. Lapage, S.P., Shelton, J.E., Mitchell, T.G. &Mackenzie, A.R. 1970 Culture collection and preservation of bacteria. InMethods in Microbiology, Vol. 3A, eds Norris, J.R. & Ribbons, D.W., pp. 135?227. London: Academic Press.
3. Onions, A.H.S. 1971 Preservation of fungi. InMethods in Microbiology, Vol. 4, eds Norris, J.R. & Ribbons, D.W., pp. 131?151. London: Academic Press.
4. Rogosa, M., Krichevsky, M.I. &Colwell, R.R. 1986Coding Microbiological Data for Computers. Berlin: Springer.
5. Rudge, R.H. 1983 Maintenance of bacteria by freeze-drying. InMaintenance of Microorganisms, eds Kirsop, B.E. & Snell, J.J.S., pp. 23?35. London: Academic Press.