Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Doi Toshio,Studies On Copper Alloys Containing Chromium (2nd Report). On the Softening and Age-hardening of Copper Alloys Containing Chromium,Journal of the Japan Institute of Metals and Materials,0021-4876,The Japan Institute of Metals and Materials,1957,21,12,720-724,https://cir.nii.ac.jp/crid/1390282681457700864,https://doi.org/10.2320/jinstmet1952.21.12_720