@article{40067,
  author       = {{Heppke, G. and Kitzerow, Heinz-Siegfried and Lötzsch, D. and Papenfuß, Ch.}},
  issn         = {{0267-8292}},
  journal      = {{Liquid Crystals}},
  keywords     = {{Condensed Matter Physics, General Materials Science, General Chemistry}},
  number       = {{3}},
  pages        = {{407--418}},
  publisher    = {{Informa UK Limited}},
  title        = {{{Blue phase mixtures exhibiting low fractions of a chiral compound experimental observation of some unusual properties}}},
  doi          = {{10.1080/02678299008047356}},
  volume       = {{8}},
  year         = {{1990}},
}

@article{40069,
  author       = {{Heppke, G. and Jéròme, B. and Kitzerow, Heinz-Siegfried and Pieranski, P.}},
  issn         = {{0267-8292}},
  journal      = {{Liquid Crystals}},
  keywords     = {{Condensed Matter Physics, General Materials Science, General Chemistry}},
  number       = {{3}},
  pages        = {{813--828}},
  publisher    = {{Informa UK Limited}},
  title        = {{{Observation of a hexagonal blue phase in systems with negative dielectric anisotropy}}},
  doi          = {{10.1080/02678298908026387}},
  volume       = {{5}},
  year         = {{1989}},
}