Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Watanabe Keiji,Various problems about surfaces and interfaces of light source materials,JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN,00192341,The Illuminating Engineering Institute of Japan,1990,74,9,572-576,https://cir.nii.ac.jp/crid/1390282679060332288,https://doi.org/10.2150/jieij1980.74.9_572