Botanical pesticide production, trade and regulatory mechanisms in sub-Saharan Africa: making a case for plant-based pesticidal products - Sola, P; Mvumi, B.M; Ogendo, J.O; Mponda, O; Kamanula, J.F; Nyirenda, S.P; Belmain, S.R; Stevenson, P.C. (Springer, 2014)