B. A. León Intriago, A. C. Montero Oleas, D. S. Mollocana Yánez, D. J. Calderón Carvajal, and M. de L. Torres Proaño, “Optical aptasensor for in situ detection and quantification of methylxanthines in Ilex guayusa ”, ACI Av. Cienc. Ing. (Quito), vol. 14, no. 1, p. 20, Apr. 2022, doi: 10.18272/aci.v14i1.2301.