- Ruby Concurrency Progress Report https://www.codeotaku.com/journal/2019-12/ruby-concurrency-progress-report/index 10 comments ruby
- Ruby Concurrency Progress Report for January. https://www.codeotaku.com/journal/2020-01/ruby-concurrency-progress-report/index 18 comments ruby
- Koichi Sasada: Progress report of "Ruby 3 Concurrency" http://www.atdot.net/~ko1/activities/2018_rubyelixirconftaiwan.pdf 22 comments ruby