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Satrijo, Saloko and D, Handito and Murad, Murad and N, Apriani B11 - The Effect of Addition Papaya Leaf Extract (Carica papaya L.) on Reducing Caffeine Levels in Robusta Coffee. IOP Conference Series: Earth and Environmental Science. ISSN E-ISSN: 1755-1307, P-ISSN:1755-1315