Be sure to discuss how their work is relevant to your work.
This should be in the Discussion section
It is important that "new" is not just new to the researcher, but also new to the community - PhDs were sometimes in the past failed because a paper was published by another researcher a few weeks previously dealing with the same work.
Phd Thesis Discussion Conclusions
a) “set the scene” with a (short) narrative
b) adopt a historical approach to the phenomenon you intend to discuss
c) take an example from the media to give your topic current relevance.
How I wrote a PhD thesis in 3 months - James Hayton PhD
The final section of your thesis may take one of several different forms. Some theses need a conclusion, while for others a summing up will be appropriate. The decisive factor will be the nature of your thesis statement and research question.
How to Write a Thesis - Lamont–Doherty Earth …
(If good ideas occur to you at this time, save them at the bottom of the page for the discussion section.) Be factual and orderly in this section, but try not to be too dry.
How to prepare for your thesis defence - James Hayton PhD
A summing up should repeat the most important issues raised in your thesis (particularly in the discussion), although preferably stated in a (slightly) different way. For example, you could frame the issues within a wider context.