OK thanks. Nah, don't have links to any papers. Well, even that one I read didn't say spaced repetition is the best way. I've made my point, not sure I'm glad I did[0], but glad you got something out of it, cheers to you too. :-)

[0] I guess it was a 'philosophical' objection - no, I don't have a better method on offer, just being sceptical of..loose claims.