@MISC {VAN ASTEN:2010b,
title = {Improving soil fertility through intercropping},
author = {Van Asten, P. },
year = {2010},
month = {March},
howpublished = {Workshop paper presented at COPAL workshop, Kumasi, Ghana, 16-18 March},
note = {An oral presentation at the COPAL workshop on Soil management for sustainable cocoa production in Kumasi, Ghana, 16-18 March 2010. 12p.},
}