@article{CTT100652630,
  author = {Katsushi Ito and Hiroaki Nakajima and Shin Sasaki},
  title = {Torsion and Supersymmetry in Omega-background},
  journal = {Journal of high Energy Physics},
  year = 2012,
}

@article{CTT100635598,
  author = {Katsushi Ito and Hiroaki Nakajima and Takuya Saka and Shin Sasaki},
  title = {N=4 instanton calculus in Omega and R-R backgrounds},
  journal = {Nuclear Physics B},
  year = 2012,
}

@article{CTT100634642,
  author = {Katsushi Ito and Satoshi Kamoshita and Shin Sasaki},
  title = {Deformed BPS Monopole in Omega-background},
  journal = {Physics Letters B},
  year = 2012,
}

@article{CTT100634640,
  author = {Yasuyuki Hatsuda and Katsushi Ito and Yuji Satoh},
  title = {T-functions and multi-gluon scattering amplitudes},
  journal = {Journal of High Energy Physics},
  year = 2012,
}