@online{whichfold,
title={Foldr Foldl Foldl' - HaskellWiki},
urldate={2016-04-21},
url={https://wiki.haskell.org/Foldr_Foldl_Foldl%27},
}

@online{decorators,
title={simeonfranklin.com - Understanding Python Decorators in 12 Easy Steps!},
urldate={2016-04-25},
url={http://simeonfranklin.com/blog/2012/jul/1/python-decorators-in-12-steps/},
}