1. Ahn, C. H., Rabe, K. M. and Triscone, J. -M., Ferroelectricity at the nanoscale: local polarization in oxide thin films and heterostructures, Science, Vol.303, No.5657 (2004), pp.488-491.
2. Blöchl, P. E., Projector augmented-wave method, Physical Review B, Vol.50, No.24 (1994), 17953.
3. Ceperley, D. M. and Alder, B. J., Ground state of the electron gas by a stochastic method, Physical Review Letters, Vol.45, No.7 (1980), pp.566-569.
4. Chang, K., Liu, J., Lin, H., Wang, N., Zhao, K., Zhang, A., Jin, F., Zhong, Y., Hu, X., Duan, W., Zhang, Q., Fu, L., Xue, Q. K., Chen, X. and Ji, S. -H., Discovery of robust in-plane ferroelectricbloity in atomic-thick SnTe, Science, Vol.353, No.6296 (2016), pp.274-278.
5. Cochran, W., Crystal stability and the theory of ferroelectricity, Advances in Physics, Vol.9, No.36 (1960), pp.387-423.