Navarro Ramírez, E. et al. 2021. Quantification of caffeine and its ef-fect on sensory qual-ity in three varieties of coffee (Coffea arabica L.), accord-ing to altitudinal level in the San Mar-tín Region. Revista Agrotecnológica Amazónica. 1, 2 (Jul. 2021), 4–14. DOI:https://doi.org/10.51252/raa.v1i2.164.