@article{CTT100635083,
  author = {S. Suzuki and K. Karashima and K. Ishigaki and M. Asada},
  title = {Heterodyne Mixing of Sub-Terahertz Output Power from Two Resonant Tunneling Diodes Using InP Schottky Barrier Diode},
  journal = {Jpn. J. Appl. Phys.},
  year = 2011,
}

@article{CTT100612575,
  author = {K. Karashima and R. Yokoyama and M. Shiraishi and S. Suzuki and S. Aoki and M. Asada},
  title = {Measurement of Oscillation Frequency and Spectral Linewidth of Sub-Terahertz InP-Based Resonant Tunneling Diode Oscillators Using Ni–InP Schottky Barrier Diode},
  journal = {Jpn. J. Appl. Phys.},
  year = 2010,
}