M. Singh1, Y. Kamal1, R. Parveen2, and S. Ahmad1, “Separation and Simultaneous Quantification of a- and b-Asarone in Acorus calamus Linn. From Indian Sub-Continent on Caffeine Modified Silica”, ajc, vol. 23, no. 5, pp. 2046–2048, Jan. 2011.