SuperMemo method
原文:https://www.supermemo.com/en/archives1990-2015/english/ol/sm2
别人的研究:http://wdxtub.lofter.com/post/1a7a1d_15282b1
study just for life!
原文:https://www.supermemo.com/en/archives1990-2015/english/ol/sm2
别人的研究:http://wdxtub.lofter.com/post/1a7a1d_15282b1