@misc{indiciaef1cca0364cd7,
  title = {A guest-free germanium clathrate.},
  author = {Arnold M Guloy and Reiner Ramlau and Zhongjia Tang and Walter Schnelle and Michael Baitinger and Yuri Grin},
  year = {2006},
  doi = {10.1038/nature05145},
  url = {https://pubmed.ncbi.nlm.nih.gov/16988708/},
  note = {Source identifier: 16988708}
}