@INPROCEEDINGS {PFEIFFER:1987, title = {Traditional yam cropping inthe Sudan savanna of Cameroon}, author = {Pfeiffer, H. and Lyonga, S. N. }, booktitle = {Tropical Root Crops: Root Crops and the African Food Crisis: Proceedings of the Third Triennial Symposium of the International Society for Tropical Root Crops - Africa Branch}, year = {1987}, pages = {61p.}, publisher = {IDRC}, location = {Ottawa}, note = {RTB; Root and Tuber; Yam}, }