Mulyono, A. 2022. BIOFILTER MANUFACTURE OF AZADIRACHTA INDICA LEAF POWDER AND ITS EFFECTIVENESS IN CAPTURING FREE RADICALS OF CIGARETTE SMOKE. Spektra: Jurnal Fisika dan Aplikasinya. 7, 2 (Sep. 2022), 59 - 66. DOI:https://doi.org/10.21009/SPEKTRA.072.01.