CEO Hiroshi Shimo wrote the item about Ethereum for “Fintech World Yearbook 2017-2018” which is yearly published by Nikkei FinTech, one and only FinTech specialized information magazine. Please have a look.
“FinTech World Yearbook 2017-2018”
* Chapter 6: Technical explanation / Block chain & Distribution ledger / 6.3.5 Ethereum
You can purchase it from Nikkei Business Publications, Inc.’s page.