Author	Title	Journal	ISSN	Publisher	Date	Volume	Number	Page	URL	URL(DOI)
Isogai Takeshi	Fundamental Theory of Vocal Singing : a discussion of details. No.1	Annual report of the Faculty of Education, Gunma University. Art and technology series	05336627	Gunma University	1973-00-00	9		1-20	http://ci.nii.ac.jp/naid/110000179022/en/