Qiu, N., Yin, H.B., Ji, B.Z., Klauke, N., Glidle, A., Zhang, Y.K., Song, H., Cai, L.L., Ma, L., Wang, G.C., Chen, L.J. and Wang, W.W. (2012) Calcium carbonate microspheres as carriers for the anticancer drug camptothecin. Materials Science and Engineering: C, 32, 2634-2640.