Author Title Journal ISSN Publisher Date Volume Number Page URL URL(DOI) Mukai Takashi The Trend of Light-Emitting Diodes (Shikoku Section) Journal of the Illuminating Engineering Institute of Japan 00192341 The Illuminating Engineering Institute of Japan (IEIJ) 1999-07-01 83 7 447-450 http://ci.nii.ac.jp/naid/110001146584/en/