You received one good set of links, but I'm pretty sure I first read of it from a Meb Faber study that I'm not in a position to look up right now. He has done a

You received one good set of links, but I'm pretty sure I first read of it from a Meb Faber study that I'm not in a position to look up right now. He has done a lot of work on simplifying and making investable decent and straight forward strategies for long term investment.