Y.-Q. Zhai, J. Chen, L.-L. Wang, J. Ma, and Z.-C. Hu, “Synthesis of High-Brightness Blue-Emitting Phosphors Sr2MgSi2O7:Eu2+, Er3+ by Gel-Combustion Method Assisted by Microwave and their Properties”, ajc, vol. 25, no. 11, pp. 6247–6250, Jun. 2013.