@article{oai:nipr.repo.nii.ac.jp:00006370,
 author = {Hall,C.M. and Hansen,T.L.},
 journal = {Advances in polar upper atmosphere research},
 month = {Sep},
 note = {P(論文), A history of ionospheric soundings from Tromsø and its vicinity in northern Norway (69°N , 19°E ) between 1932 and present is given.},
 pages = {155--166},
 title = {20th century operation of the Tromsø Ionosonde},
 volume = {17},
 year = {2003}
}