http://www.diku.dk/~torbenm/Basics/basics_lulu2.pdf
https://www.amazon.com/School-Niklaus-Wirth-Art-Simplicity/dp/1558607234
/Pragmatic.Language.Implementation.Patterns.Dec.2009
http://dns.uls.cl/~ej/web_Elect_2012/Lect_Elect_2010/Pragmatic.Language.Implementation.Patterns.Dec.2009.pdf