J. Li, J. Shi, J. Shen, H. Man, M. Wang, and H. Zhang, “Specific Recognition of Breast Cancer Cells In Vitro Using Near Infrared-Emitting Long-Persistence Luminescent Zn3Ga2Ge2O10:Cr3+ Nanoprobes”, Nano-Micro Lett, vol. 7, no. 2, pp. 138-145, Dec. 2014.