Collective action among african smallholders: Trends and lessons for future development strategies - Wanyama, Fredrick; Poulton, Colin; Markelova, Helen; Dutilly-Diane, Celine; Hendrikse, George; Bijman, Jos; Francesconi, Gian Nicola; Bernard, Tanguy; Cook, Michael; Badiane, Ousmane; Wouterse, Fleur (International Food Policy Research Institute, 2014)