Ioele, G., Cione, E., Risoli, A., Genchi G. and Ragno, G. (2005) Accelerated photostability study of tretinoin and isotretinoin in liposomes formulations. International Jour- nal of Pharmaceutics, 60(1-2), 251-260.
 Lima, E.M., Diniz, D.G. and Antoniosi-Filho, N.R. (2005) Development of a gas chromatography method for the determination of isotretinoin and its degradation products in pharmaceuticals. Journal of Pharmaceutical of Bio- medical Analysis, 38(4), 678-685.
 Tashtoush, M.B. Jacobson, E.L. and Jacobson, M.K. (2007) A rapid HPLC method for simultaneous deter- mination of tretinoin and isotretinoin in dermatological formulations. Journal of Pharmaceutical and Biomedical Analysis, 43(3), 859-864.
 Tan, X., Meltzer, N. and Lindenbaum, S. (1992) Solid- state stability studies of 13-cis-retinoic acid and all- transretinoic acid using microcalorimetry and HPLC analysis. Pharmaceutical Research, 9(9), 1203-1208.
 Crank, G. and Pardijanto, M.S. (1995) Photooxidations and photosensitized oxidations of vitamin A and its palmitate ester. Journal of Photochemistry and Photobio- logy A: Chemistry, 85(1-2), 93-100.
 Bempong, D.K., Honigberg, I.L. and Meltzer, N.M. (1993) Separation of 13-cis and all-trans retinoic acid and their photodegradable products using capillary zone electrophoresis and micellar electrokinetic chromato- graphy (MEC). Journal of Pharmaceutical and Biomedi- cal Analysis, 11(9), 829-833.