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M. L.  Patil and Borate, H. B., ?Synthesis of substituted tetrahydro-1H-xanthen-1-ones and xanthenes?, Journal of Chemical Research , no. 7, pp. 454-456, 2005.\par \par K.  Venkatesan, Pujari, S. S., Lahoti, R. J., and Srinivasan, K. V., ?Efficient synthesis of 1,8-dioxo-octahydro-xanthene derivatives promoted by a room temperature ionic liquid at ambient conditions under ultrasound irradiation?, Ultrasonics Sonochemistry, vol. 15, no. 4, pp. 548-553, 2008.\par \par A. K.  Bhattacharya, Rana, K. C., Mujahid, M., Sehar, I., and Saxena, A. K., ?Synthesis and in vitro study of 14-aryl-14H-dibenzo[a.j]xanthenes as cytotoxic agents?, Bioorganic & Medicinal Chemistry Letters, vol. 19, no. 19, pp. 5590-5593, 2009.\par \par }