K. Chongsri, A. Kiewrugsa, K. Chuienkha, T. Junkhiew, T. Juepanit, and A. Sungthong, “Temperature Dependent Photoluminescence Study on ZnO Nanostructures”, Thai J. Nanosci. Nanotechnol., vol. 3, no. 2, pp. 17–22, Dec. 2018.