@article{oai:nagoya.repo.nii.ac.jp:00031516,
 author = {Fukumura, Teruo and Hara, Kenzo},
 issue = {2},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Feb},
 pages = {217--223},
 title = {Phoneme figures of sustained oral vowels by two-dimensional representation (I) : Some basic observations},
 volume = {6},
 year = {1955}
}