| 2009 |
Kazuhiro NISHIYAMA |
RubyGems traps |
| 2010 |
Kazuhiro NISHIYAMA |
Daily Ruby |
| 2011 |
Kazuhiro NISHIYAMA |
How to make secure program |
| 2014 |
Kazuhiro NISHIYAMA |
Archeology of Ruby: Removed Features (Ruby 考古学 消された機能編) |
| 2019 |
Kazuhiro NISHIYAMA |
RubyData Workshop |
| 2022 |
Kazuhiro NISHIYAMA |
History of Japanese Ruby reference manual, and future |