1. Frankland, J., Ovington, J. D., Macrae, C.: Spatial and seasonal variations in soil, litter and ground vegetation in some Lake District Woodlands J. Ecol. 51, 97?112 (1963)
2. Hughes, M. K.: Investigations of the ecosystem energetics of an English woodland. Ph. D thesis, University of Durham (1970).
3. ?: Ground vegetation and forest litter production. Methods of study in soil ecology. Proceedings of the Paris Symposium p. 145?150. Paris: UNESCO 1970.
4. Hughes, M. K.: Tree biocontent, net production and litter fall in a deciduous woodland. In press a.
5. Hughes, M. K. Seasonal calorific values from a deciduous woodland in England. In press b.