@article{CTT100570085,
  author = {Hiroki Taniguchi and Masaki Takesada and Mitsuru Itoh and Toshirou Yagi},
  title = {Precursory Softening of Polar Mode in Isotope-Exchanged Paraelectric Strontium Titanate Studied by Raman Scattering},
  journal = {Ferroelectrics},
  year = 2006,
}