Purnomo, A., Mun’im, A., & Hayun, H. (2023). DETERMINATION OF ALLANTOIN LEVELS AS A RESULT OF OPTIMIZATION OF IONIC LIQUID-ULTRASOUND ASSISTED EXTRACTION OF COMFREY LEAVES BY TLC-DENSITOMETRY. BIOVALENTIA: Biological Research Journal, 8(2), 206–212. https://doi.org/10.24233/biov.8.2.2022.306