http://www.mogami-wire.co.jp/paper/physical-constants.html
http://www.jssa.gr.jp/contents/faq-article/q6/
https://en.wikipedia.org/wiki/Permeability_(electromagnetism)
https://www.evernote.com/shard/s49/sh/4b559739-6462-4bbd-8892-fa310717dc54/e76ee69c5331f077c12db76d85f4324c
https://ja.wikipedia.org/wiki/%E9%9B%BB%E6%B0%97%E6%8A%B5%E6%8A%97%E7%8E%87%E3%81%AE%E6%AF%94%E8%BC%83
http://www.kobelco.co.jp/titan/characteristic/
https://www.haynesintl.com/pdf/h3009.pdf
http://www.nssy.co.jp/pages/product_stainless_heat.html