Mokhtar M. Mabrouk, Sherin F. Hammad, Fotouh R. Mansour, and Mary A. Michael, “Reversed phase high performance liquid chromatographic method for simultaneous determination of phenylephrine hydrochloride and ketorolac tromethamine”, World J Pharm Sci, vol. 3, no. 10, pp. 2152–2159, Oct. 2015.