Agroforestry : principles and practice : proceedings of an international conference, 23-28 July 1989 at the University of Edinburgh, Edinburgh, UK, held under the auspices of the International Forest Science Consultancy, a part of Land and Timber Services, Edinburgh, UK and the Department of Forestry & Natural Resources, now a part of Institute of Ecology and Resource Management, University of Edinburgh, UK - Jarvis, P. G. (Paul Gordon) (Elsevier, 1991)