@ARTICLE {DE GROOTE:2003, title = {Economic impact of biological control of water hyacinth in southern Benin}, author = {De Groote, H. and Ajuonu, O. and Attignon, S. and Djessou, R. and Neuenschwander, P. }, journal = {Ecological Economics}, year = {2003}, volume = {45}, pages = {105--117}, }