Design and construction of a tubular biodigester that works with alpaca manure at a height of 4200 MSL. Theorēma (Lima, Segunda época, En línea) [Internet]. 2016 Oct. 25 [cited 2024 Jul. 17];(4):051-64. Available from: https://revistasinvestigacion.unmsm.edu.pe/index.php/Theo/article/view/12603