Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ono Hiroaki and Ogawa Akihiro and Yamasaki Takahiro and Koshihara Takahiro and Kodama Toshifumi and Iizuka Yukinori and Oshige Takahiko,Development of “Twin-illumination and Subtraction Technique” for Detection of Concave and Convex Defects on Steel Pipes in Hot Condition,Tetsu-to-Hagane,00211575,The Iron and Steel Institute of Japan,2018,104,1,11-17,https://cir.nii.ac.jp/crid/1390282680191751680,https://doi.org/10.2355/tetsutohagane.tetsu-2017-029