Arévalo, Fermín H., and Gladys C. Arias. “Study of the Stirring Speed for the Biomass Production of Kefir Grains”. Ciencia e Investigación 17, no. 1 (June 16, 2014): 16–20. Accessed July 17, 2024. https://revistasinvestigacion.unmsm.edu.pe/index.php/farma/article/view/11088.