@misc{KoehlerBecker1976,
  author    = {K{\"o}hler, H. and Becker, Charles R.},
  title     = {Infrared-active lattice vibrations in SnSe\(_2\)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-30838},
  year      = {1976},
  abstract  = {No abstract available},
  language  = {en}
}
@misc{UnkelbachBeckerKoehleretal.1973,
  author    = {Unkelbach, K. H. and Becker, Charles R. and K{\"o}hler, H. and Middendorff, A. V.},
  title     = {Optical Phonons of Bi\(_2\)Te\(_3\)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-30809},
  year      = {1973},
  abstract  = {No abstract available},
  language  = {en}
}