@misc{peining2015a,
  title = {Hyperbolic phonon-polaritons in boron nitride for near-field optical imaging and focusing},
  author = {Peining Li, Martin Lewin, Andrey V. Kretinin, Joshua D. Caldwell, Kostya S. Novoselov, Takashi Taniguchi, Kenji Watanabe, Fabian Gaussmann, Thomas Taubner},
  publisher = {Springer Science and Business Media LLC},
  year = {2015-06-26},
  keywords = {Hyperbolic materials, phonon polariton, near-field optical}
}