[1] German Inst Dev & Sustainabil, Inter & Transnatl Cooperat, Bonn, Germany
[2] Univ Botswana, Fac Social Sci, Dept Econ, Gaborone, Botswana
[3] Univ Birmingham, Sch Chem Engn, Birmingham, England
[4] Botswana Univ Agr & Nat Resources, Dept Legal Serv, Off Vice Chancellor, Gaborone, Botswana