1. Cryan, W.S.: A method for axenizing large numbers of nematodes. J. Parasitol. 49, 351?352 (1963)
2. Dougherty, E.C., Solberg, B.: Axenic cultivation of an enchytraeid annelid. Nature (Lond.) 192, 184?185 (1961)
3. Heal, O.W., Latter, P.M., Howson, G.: A study of the rates of decomposition of organic matter. In. Production ecology of some British moors and montane grasslands (O.W. Heal, D.F. Perkins, eds.) Berlin-Heidelberg-New York: Springer 1977 (in press)
4. Latter, P.M., Howson, G.: Studies on the microfauna of blanket bog with particular reference to Enchytraeidae. II. Growth and survival of Cognettia sphagnetorum (Vejd.) on various substrates. J. Anim. Ecol. (in press, 1978)
5. Lev, M.: Studies on bacterial associations in germ-free animals and animals with defined floras. In: Symbiotic Associations?Symp. Soc. Gen. Microbiol. 13 (P.S. Nutman, B. Mosse, eds.), pp. 325?334, Cambridge: C.U.P. 1963