M. AKMAL KHAN*, D. SHAHWAR, N. AHMAD, Z.-U.-D. KHAN†, and M. AJAIB†, “Chemical Constituents of Carissa opaca Extracts and Their Evaluation as Antioxidants and Preservatives in Edible Oils”, ajc, vol. 22, no. 1, pp. 379–388, Dec. 2009.