Mpeta D, Kuzilwa J, Sebyiga B. ANALYSIS OF CONTRACT FARMING EFFECTS ON EFFICIENCY AND PRODUCTIVITY OF SMALL-SCALE SUNFLOWER FARMERS IN TANZANIA – A PROPENSITY SCORE METHOD APPROACH. aspe [Internet]. 2018Mar.30 [cited 2024May2];17(1):75-4. Available from: https://js.wne.sggw.pl/index.php/aspe/article/view/4332