@article{CTT100417111,
  author = {Behrouz Homayoun Far and Matsuroh Nakamichi and Mitsuji Sampei},
  title = {Automatic Diagnostic Rule Generation for Rule-Based Controllers Based on Qualitative Sensitivity Analysis},
  journal = {Transactions of the Institute of Electrical Engineers of Japan},
  year = 1990,
}

@article{CTT100417112,
  author = {Mitsuji Sampei and Tsutomu Mita and Matsuroh Nakamichi},
  title = {An Algebraic Approach to H-infinity Output Feedback Control Problems},
  journal = {Systems and Control Letters},
  year = 1990,
}