@article{CTT100679477,
  author = {H. Kanaya and R. Sogabe and T. Maekawa and S. Suzuki and M. Asada},
  title = {Fundamental Oscillation up to 1.42 THz in Resonant Tunneling Diodes by Optimized Collector Spacer Thickness},
  journal = {J. Infrared, Millimeter and Terahertz Waves},
  year = 2014,
}

@article{CTT100679483,
  author = {H. Kanaya and H. Shibayama and R. Sogabe and S. Suzuki and M. Asada},
  title = {Fundamental Oscillation up to 1.31 THz in Resonant Tunneling Diodes with Thin Well and Barriers},
  journal = {Appl. Phys. Express},
  year = 2012,
}