[BioC] normexp background correction

[Edoardo Giacopuzzi]

I'm using limma package to perform microarray data analysis. I've
tried different backgorund correction methods, expecially normexp and
edwards. I've read that normexp is considered the best by now, but I
can't found any detailed information about it (how it works on data
and so on). 
Does anyone know where I can get this kind of information?

Thanks!
Edoardo (University of Brescia)