@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{CTT100620189,
  author = {Katsushi ITO and Hiroaki Nakajima and Takuya Saka and Shin Sasaki},
  title = {N=2 instanton effective action in Omega-background and D3/D(-1)-brane system in R-R background},
  journal = {Journal of High Energy Physics},
  year = 2010,
}

@article{CTT100597004,
  author = {Katsushi ITO and Hiroaki Nakajima and Takuya Saka and Shin Sasaki},
  title = {Instanton calculus in deformed N=4 super Yang-Mills theories},
  journal = {Journal of High Energy Physics},
  year = 2009,
}