What's new in purely functional data structures since Okasaki? (2010) - https://news.ycombinator.com/item?id=11056704 - Feb 2016 (42 comments)
What's new in purely functional data structures since Okasaki? (2010) - https://news.ycombinator.com/item?id=7081191 - Jan 2014 (17 comments)
What's new in purely functional data structures since Okasaki? - https://news.ycombinator.com/item?id=1983461 - Dec 2010 (2 comments)
What's new in purely functional data structures since Okasaki - https://news.ycombinator.com/item?id=1713594 - Sept 2010 (1 comment)