* [Breadth-First Numbering: Lessons from a Small Exercise in Algorithm Design](http://www.cs.tufts.edu/~nr/cs257/archive/chris-okasaki/breadth-first.pdf)
* :scroll: [Concatenative Programming: An Overlooked Paradigm in Functional Programming](http://mitarbeiter.hs-heilbronn.de/~herzberg/Publications/ICSOFT.2009.pdf)