@article{CTT100916178,
  author = {Kentaro Saji and Masaaki Umehara and Kotaro Yamada},
  title = {Deformations of cuspidal edges in a 3-dimensional space form},
  journal = {Kodai Math. J.},
  year = 2024,
}

@article{CTT100916175,
  author = {Atsufumi Honda and Naokawa Kosuke and Kentaro Saji and Masaaki Umehara and Kotaro Yamada},
  title = {Symmetries of cross caps},
  journal = {TOHOKU MATH. J.},
  year = 2023,
}

@article{CTT100916176,
  author = {Atsufumi Honda and Naokawa Kosuke and Kentaro Saji and Masaaki Umehara and Kotaro Yamada},
  title = {A generalization of zakalyukin's lemma, and symmetries of surface singularities},
  journal = {Journal of Singularities},
  year = 2022,
}