Help - Anderson localization

Hello everyone,

I'm a graduate student and I am doing a simple work on 1D Anderson localization. I need to derive the expression for the localization length when the energies are randomly distributed in the region of $$\left[ \frac{W}{2},-\frac{W}{2} \right]$$. I know the localization length in the limit $$W<<V$$, where $$V$$ are the of diagonal elements of the hamiltonian, is $$\frac{W^2}{96V^2}$$. this expression can be derived while using the second order green function treatment. Since quantum mechanics is not my main studies, I didn't understand the derivation from the green function (I have only found it in Thouless book - Ill condensed matter). If someone know how to derive it, It will help me a lot, or at least know a good reference which explains it simply.
forgive me for my bad English.
thanks,
Tal Weiss.