University of California, Berkeley: S. Dasgupta, C.H. Papadimitriou, and U.V. Vazirani's "Divide-and-Conquer Algorithms"
Read Chapter 2 of S. Dasgupta, C.H. Papadimitriou, and U.V. Vazirani's book Algorithms.
Click https://web.archive.org/web/20120308140658/http://www.cs.berkeley.edu/~vazirani/algorithms/chap2.pdf link to open resource.