Advice about PhD Thesis

[user]

I have been doing a part-time PhD thesis for almost 9 years. During that
time I have published a number of papers  based on work for my thesis. 
I am about to write up my thesis, but need some advice. In the review of
the literature that will be included, do I refer to my published papers
that refer to material that belongs to the thesis OR do I carefully
excise any reference to my published work until describing it in greater
detail in the thesis proper?

Thanks in advance

Jacques Soddell