@article{oai:kanazawa-u.repo.nii.ac.jp:00010464,
 author = {Umino, Susumu and Nealson, Ken and Wood, Bernard},
 issue = {8},
 journal = {Physics Today},
 month = {Jan},
 pages = {36--41},
 title = {Drilling to Earth's mantle},
 volume = {66},
 year = {2013}
}