For general information, see http://whatis.techtarget.com/definition/0,,sid9_gci214244,00.html. A finite state-machine simulator is available at http://www.belgarath.demon.co.uk/java/fsme.html.

A finite-state automaton simulator is available at http://iamexwiwww.unibe.ch/studenten/mguenter/demos/Antenna/index.html.

General information is at http://cui.unige.ch/db-research/Enseignement/analyseinfo/AboutBNF.html. For some history of BNF, see http://www2.andrews.edu/~bidwell/456/history.html.

See http://www.cogs.susx.ac.uk/users/gabro/lsys/lsys.html.

A biography of von Koch is at http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Koch.html.