1. Wu LQ, Qi WH, Ge XS, Ji DH, Li ZZ, Tang GD, Zhong W (2017) Europhys Lett 120:27001
2. Wu LQ (2016) Study of oxygen ionic valence and its influence on the magnetic property of the perovskite manganites La1-xSrxMnO3 (Master’s thesis). Hebei Normal University, Shijiazhuang
3. Urushibara A, Moritomo Y, Arima T, Asamitsu A, Kido G, Tokura Y (1995) Phys Rev B 51:14103
4. Jonker GH, Van Santen JH (1950) Physica 16:337
5. Seah MP, Brown MT (1998) J Electron Spectrosc Relat Phenom 95:71