@article{CTT100857591,
  author = {Teruaki Suyama and Yuichiro Tada and Masahide Yamaguchi},
  title = {Revisiting non-Gaussianity in non-attractor inflation models in the light of the cosmological soft theorem},
  journal = {Progress of Theoretical and Experimental Physics},
  year = 2021,
}

@article{CTT100857588,
  author = {Teruaki Suyama and Yuichiro Tada and Masahide Yamaguchi},
  title = {Local observer effect on the cosmological soft theorem},
  journal = {Progress of Theoretical and Experimental Physics},
  year = 2020,
}