@article{Wittrock2010,
  author    = {Wittrock, Ulrich},
  title     = {Laryngeally echolocating bats (Brief Communication Arising)},
  series = {Nature},
  volume    = {466},
  journal   = {Nature},
  doi       = {10.1038/nature09156},
  pages     = {E6},
  year      = {2010},
  language  = {mul}
}
@misc{OPUS4-4711,
  title     = {6th Laser Ceramics Symposium},
  series = {Opt. Mat.},
  volume    = {34},
  journal   = {Opt. Mat.},
  editor    = {Wittrock, Ulrich and Kynast, Ulrich and J{\"u}stel, Thomas and Bredol, Michael},
  publisher = {Elsevier B.V.},
  pages     = {935 -- 1002},
  year      = {2012},
  language  = {mul}
}