Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Okamoto Hiroshi,Environment Stress Cracking of Polyethylene and Polyethylene Communication Cable Sheath,Kobunshi Kagaku,00232556,"The Society of Polymer Science, Japan",1971,28,310,97-108,https://cir.nii.ac.jp/crid/1390001206519492224,https://doi.org/10.1295/koron1944.28.97