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Quantification of Sunscreen Benzophenone-4 in Hair Shampoos by Hydrophilic Interactions Thin-Layer Chromatography/Densitometry or Derivative UV SpectrophotometrySobańska, Anna W.; Kałębasiak, Katarzyna; Pyzowski, Jarosław; Brzezińska, Elżbieta · Journal of Analytical Methods in Chemistry · 2015