K. KISHORE J and P. RAO K, “DEVELOPMENT AND VALIDATION OF A GAS CHROMATOGRAPHY HEADSPACE METHOD FOR THE SIMULTANEOUS QUANTIFICATION OF SIX ORGANIC VOLATILE IMPURITIES IN SUMATRIPTAN SUCCINATEAPI AND ITS PHARMACEUTICAL DOSAGE FORMS”, Asian J Pharm Clin Res, vol. 13, no. 5, pp. 210–218, May 2020.