Lawanson AO, Novignon J. Efficiency of Health Systems in Sub-Sahara Africa: A Comparative Analysis of Time Varying Stochastic Frontier Models. AJHSS [Internet]. 2016 Jun. 16 [cited 2024 Apr. 26];4(3). Available from: https://ajouronline.com/index.php/AJHSS/article/view/3829