@article{oai:u-ryukyu.repo.nii.ac.jp:02005310,
 author = {Kamiyama, Yasuhiko and 神山, 靖彦},
 journal = {Ryukyu mathematical journal},
 month = {Feb},
 note = {紀要論文},
 pages = {7--12},
 title = {An elementary proof of a theorem of T. F. Havel},
 volume = {5},
 year = {1993}
}