E. Ganeva, K. Proskurina, O. Ievtifieieva, I. Petukhova, and O. Kizim, “Development and validation of the spectrophotometric quantitative determination method of prednisolone in an ointment with hydrophilic basis”, ScienceRise: Pharmaceutical Science, no. 4 (8), pp. 15–20, Aug. 2017.