The idea is pretty much spaced repetition learning (http://en.wikipedia.org/wiki/Spaced_repetition http://en.wikipedia.org/wiki/Spaced_repetition), even though

The idea is pretty much spaced repetition learning (http://en.wikipedia.org/wiki/Spaced_repetition http://en.wikipedia.org/wiki/Spaced_repetition), even though article doesn't call it that or make any references to the existing work.