URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/performance-comparison-of-three-modified-howland-current-source-circuits-in-low-cost-bioimpedance-analyzer-for-bio-phantom-signal-acquisitio-dcfcd07e645d245babe887e5e2daa016/70e26762-7753-11f0-ae8a-e4434b0aa6de