“Improvement of extraction instrumental techniques determination of paracetamol by HPLC, TLC, photocolorimetry and digital colorimetry” (2019) Sorbtsionnye i Khromatograficheskie Protsessy, 13(4). Available at: https://journals.vsu.ru/sorpchrom/article/view/1668 (Accessed: 4 April 2026).