@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}
}
@article{KoehlerBecker1974,
  author    = {K{\"o}hler, H. and Becker, Charles R.},
  title     = {Optically active lattice vibrations in Bi\(_2\)Se\(_3\)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-31296},
  year      = {1974},
  abstract  = {The preparation of Bi2Sea single crystals with low free carrier densities allowed an investigation of the lattice vibrations to be carried out from the reflectivity of cleavage planes at nearly normal incidence of the radiation (E ~ c). The experimental results ean be explained with two classical oscillators, whose eigenfrequencies oceur at 92 and 69.5 cm-I. The static dielectric constant was determined to be 100 ± 10 for E ~ c.},
  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}
}