- http://paulgraham.com/bel.html
- https://sep.yimg.com/ty/cdn/paulgraham/bellanguage.txt?t=1570993483&
- https://sep.yimg.com/ty/cdn/paulgraham/bel.bel?t=1570993483&
- https://github.com/aarongough/sexpistol
- https://github.com/aarongough/flea
- http://thingsaaronmade.com/blog/cheating-yor-way-to-lisp-with-ruby.html
- http://thingsaaronmade.com/blog/introducing-flea.html
- http://norvig.com/lispy.html
- https://github.com/seattlerb/sexp_processor
- https://github.com/seattlerb/ruby2ruby
- https://www.schneems.com/2018/04/30/how-to-implement-a-ruby-hash-like-grammar-in-parslet/
- https://github.com/kschiess/parslet/blob/master/example/minilisp.rb
- http://www.rubyinside.com/parslet-a-simple-peg-parser-framework-for-ruby-4187.html
- https://github.com/jamesmoriarty/lisp/blob/master/lib/lisp.rb
- https://github.com/luksamuk/believe
- https://github.com/jeremyschlatter/chime
- https://github.com/ajlopez/beljs
- https://github.com/abdulbahajaj/brutus
- https://blog.cleancoder.com/uncle-bob/2019/08/22/WhyClojure.html
- https://www.schneems.com/2018/04/30/how-to-implement-a-ruby-hash-like-grammar-in-parslet/
- http://www.randomhacks.net/2005/12/03/why-ruby-is-an-acceptable-lisp/
- https://t-a-w.blogspot.com/2006/07/rlisp-lisp-naturally-embedded-in-ruby.html
- https://on-ruby.blogspot.com/2007/01/will-rubinius-be-acceptable-lisp.html
- http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/179642
- https://halyph.blogspot.com/2011/01/lisp-ruby-acceptable-and-not-acceptable.html
- https://steve-yegge.blogspot.com/2006/04/lisp-is-not-acceptable-lisp.html
- https://en.wikipedia.org/wiki/Hy
- http://arclanguage.org/item?id=21354
- https://news.ycombinator.com/item?id=21231208
- http://www-formal.stanford.edu/jmc/recursive/recursive.html