M. Monar, I. Dávalos, S. Zapata, M. Caviedes, and L. Ramírez-Cárdenas, “Chemical and microbiological characterization of Ecuadorian homemade water kefir”, ACI Av. Cienc. Ing. (Quito), vol. 6, no. 1, Jun. 2014, doi: 10.18272/aci.v6i1.160.