@article{CTT100716423,
  author = {Taro Tatsuno and Joji Nasu and Eriko Mizoguchi and Makoto Naka and Sumio Ishihara},
  title = {Magnetic Field Effects in a Correlated Electron System with Spin-State Degree of Freedom -Implication of an Excitonic Insulator-},
  journal = {Journal of the Physical Society of Japan},
  year = 2016,
}

@article{CTT100716802,
  author = {Joji Nasu and Tsutomu Watanabe and Makoto Naka and Sumio Ishihara},
  title = {Phase diagram and collective excitations in an excitonic insulator from an orbital physics viewpoint},
  journal = {Physical Review B},
  year = 2016,
}