S. Hemambika, K. Raghu Babu and N. Annapurna 2017. Spectrophotometric Determination of Raltgravir Potassium and Galantamine Hydrobromide Pharmaceuticals using Folin-Ciocalteu reagent and Iron (II) - Orthophenanthraline as Chromogenic agents. International Journal of Research in Chemistry and Environment (IJRCE). 7, 3 (Jun. 2017), 46–53.