Mello, M. R. P. do A. ., Minazzi-Rodrigues, R. S. ., Carvalho, J. B. de . and Shirose, I. . (1992) “Comparative study of extraction methods to determine caffeine in coffee”, Instituto Adolfo Lutz Journal - RIAL, 52(1-2), pp. 89–95. doi: 10.53393/rial.1992.52.35972.