(4) 吉野勝美·加藤 寛:「新しい高分子絶縁材料ポリプロピレンとその応用」,電気学誌,Vol. 116, No. 11, pp. 745-748 (1996)
(5) K. Yoshino, T. Demura, M. Kawahigashi, Y. Miyashita, K. Kurahashi, and Y. Matsuda : “The Application of Novel polypropylene to the Insulation of Electric Power Cable”, T. IEE Japan, Vol. 122-A, No. 9, pp. 872-879 (2002-9) (in Japanese)