@article{CTT100417113,
  author = {Yuichi Chida and Tsutomu Mita and Mitsuji Sampei and Jing Wen Wang},
  title = {Direct Derivation of H-infinity State Feedback Control Law Using Bounded Real Lemma},
  journal = {Transactions of the Institute of Systems, Control and Information Engineers},
  year = 1989,
}

@article{CTT100417114,
  author = {Mitsuji Sampei and Masatoshi Kamei and Matsuroh Nakamichi},
  title = {Approximate Input-Output Linearization of Discrete Time Nonlinear Systems},
  journal = {Transactions of Society of Instrument and Control Engineers Japan},
  year = 1989,
}

@article{CTT100417115,
  author = {Mitsuji Sampei},
  title = {Equivalence of Nonlinear Systems in the Sense of Trajectory},
  journal = {Transactions of Society of Instrument and Control Engineers Japan},
  year = 1989,
}