Ndyabawe K, Kisaalita WS. Validity of the Africa-wide Lang factor of 2.63 for estimating small biogas plant installation costs in Uganda. Int J Agric & Biol Eng [Internet]. 2014 Feb. 28 [cited 2026 Jan. 27];7(1):70-6. Available from: https://ijabe.org/index.php/ijabe/article/view/880