M. P.  Wadekar, Rode, C. V., Bendale, Y. N., Patil, K. R., Gaikwad, A. B., and Prabhune, A., ?Effect of calcination cycles on the preparation of tin oxide based traditional drug: studies on its formation and characterization?, Journal of Pharmaceutical and Biomedical Analysis, vol. 41, no. 4, pp. 1473-1478, 2006.