Faculty of Economics and Management,University of Yaounde Ⅱ,P.O.Box 18 Soa Yaounde,Cameroon;
Liaison Office Cameroon,West and Central Africa,World Vegetable Center,P.O.Box 2008 Messa Yaounde,Cameroon;
Faculty of Economics and Management,University of Yaounde Ⅱ,P.O.Box 18 Soa Yaounde,Cameroon;
Samanko Research Station,West and Central Africa,World Vegetable Center,P.O.Box 320 Bamako,Mali;