http://cmrr-star.ucsd.edu/psiegel/pubs/87/codes_spectral_nulls.pdf

http://petrified.ucsd.edu/~ispg-adm/pubs/Swaminathan_TSP_112007.pdf

which basically involve a lot of statistical analysis. I have a PhD in EE but my major was circuit design. I have taken basic courses in Probability but never went beyond that. I wish to now learn the ways to analyse systems whose mode of operation is far from being linear. This involves time series analysis and maybe more.

I wish to know the succession of books that I might have to read in order to be able to understand papers that I have cited above. Also, I like books which are easier to understand.

I'll greatly appreciate if you can suggest me a good plan of action so that I can finally be able to read and understand papers of the above kind.