The paper I linked is the shortest one on the topic, and you're right, it doesn't have all the info for those that want to go deeper.
Again, my claims are that: 1. Ebbinghaus's Forgetting Curve is real, although probably not as bad as he/we thought (two latest papers that I have on it: DOI: 10.1016/j.jmp.2010.08.009, DOI: 10/f7vfcn); 2. Spaced Repetition is the best way to beat Ebbinghaus's Forgetting Curve for most people (I read a bunch of articles--the DOI's I still have saved are the following, but I can't remember which papers were better than others - DOI: 10.1111/j.1745-6916.2006.00012.x, DOI: 10.1177/1529100612453266 <-this one is the one on which the article I linked is based, DOI: http://dx.doi.org/10.1037/stl0000036).
I could look for more, I haven't had to prove this for a long time, however, like I said, I love to be wrong (especially since I use this for my students, so if there's a better way, I'd like to know!). Do you have any links to studies that contradict 1. Ebbinghaus's Forgetting Curve and 2. Spaced Repetition as the best way to learn facts?
Cheers man, I'm happy you forced me to dig up these papers :)
-TOF