Question on Sit and Go Theory: 3-Handed/Heads Up
Are there any books focused on 3-handed/heads up poker theory? I want some theory oriented to heads up stages of MTT/STT, where stacks are not too deep (in relation to BB, like in cash games, where people are 100-200 BB deep), but not too shallow to make it a push/fold scenario. Something like in 20-40 BB deep.
I feel that this is my main weakness on late stages of Sit and Go's at microstakes. I feel my game is pretty polarized between being too passive or too aggro in these stages, and at some point, I feel that I just don't know what I'm doing, what I'm looking for in a flop, what should be an ideal 3-betting range without too much gambling...
Can someone help me out?