@article{WallaWiechaMecklenbecketal.2017,
  author    = {Frederik William Walla and Matthias Wiecha and Nicolas Mecklenbeck and Sabri Beldi and Fritz Keilmann and Mark David Thomson and Hartmut Roskos},
  title     = {Anisotropic excitation of surface plasmon polaritons on a metal film by a scattering-type scanning near-field microscope with a non-rotationally-symmetric probe tip},
  journal   = {Nanophotonics},
  volume    = {7.2018},
  number    = {1},
  pages     = {269 -- 276},
  doi       = {10.1515/nanoph-2017-0042},
  year      = {2017},
}