I read Bollinger on Bollinger Bands. He is not the easiest to understand. He runs a bunch of web sites which may or may not be of value to people. I tried one a while ago and didn't fully understand it so I moved on. I think he said he originally developed this for options. I don't trade options. That was the hardest part of the series 7 test for me so I figure that was a good sign not to mess with them.

I use the Hammer into the lower BB with stocks in an uptrend as a buy signal. Recent example was ABAT.