P. C. Narayani, J. Anbu, R. Vasuki, and R. Hari, “Invitro and Invivo Anti-Arthritic Activity of Combined Ethanolic Extracts of <i>Calotropis gigantea</i> and <i>Cardiospermum halicacabum</i> in Wistar Rats”, JNR, vol. 14, no. 1, pp. 58–66, Dec. 2013.