Author	Title	Journal	ISSN	Publisher	Date	Volume	Number	Page	URL	URL(DOI)
Sato  Hideaki,Kikuchi  Tsuneo,Tsuchiya  Yoshihiro	On the effects of the unnecessary external light on the screen for OHP which has influence on the eyesight	Research reports of the Tsuruoka Technical College	02861232	Tsuruoka National College of Technology	1979-07-25	13		137-148	http://ci.nii.ac.jp/naid/110000260266/en/