Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Matsui Matsunaga,Far Infrared Spectral Radiometry of Thermal Radiator in the Low Temperature Range,JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN,00192341,The Illuminating Engineering Institute of Japan,1989,73,4,186-190,https://cir.nii.ac.jp/crid/1390001204085512448,https://doi.org/10.2150/jieij1980.73.4_186