Zuckert, Catherine H., "Timaeus-Critias: Completing or Challenging Socratic Political Philosophy?," Plato's Philosophers: The Coherence of the Dialogues, Chicago: University of Chicago Press, 2009, 420-81.

Excerpt:

Socrates concluded his discussion of the city in speech, which he proposed in the Republic, by observing that it did not matter whether this city ever actually came into being, because it would serve as “a paradigm laid up in heaven for the man who wants to see and found a city within himself” (592b). Nevertheless, in the Timaeus Plato has Socrates express a desire to see his city in motion at war with another, and two of his guests promise to satisfy his desire.

Online:
Amazon