{"id":"002034966","type":"article","title":"A new contribution to the Holocene vegetation history of the West African Sahel: pollen from Oursi, Burkina Faso and charcoal from three sites in northeast Nigeria","pages":"31-39","container-title":"Vegetation History and Archaeobotany, 4,1 (1995","author":[{"family":"Ballouche","given":"Aziz"},{"family":"Neumann","given":"Katharina"}],"issued":{"raw":"1995"}}