S. L. Turwale, R. K. Dwivedi, and M. T. Bachute, “Development of Fast Reverse Phase Liquid Chromatographic Method for Simultaneous Analysis of Betamethasone Dipropionate and Calcipotriol in Ointments and Bulk Drug”, ajc, vol. 26, no. 19, pp. 6465–6468, Sep. 2014.