R.-X. Zhu, L. Zhao, Y.-K. Zhang, P. Luo, S.-H. Liu, and J.-G. Wang, “Sequential treatment with ursolic acid chlorophenyl triazole followed by 5-fluorouracil shows synergistic activity in small cell lung cancer cells”, Bangladesh J Pharmacol, vol. 10, no. 1, pp. 197–204, Mar. 2015.