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What is value investing? What are the key principles of value investing?
Fama-French would be a couple of names if you want to look at this from a value/growth dichotomy.  A simplified form of this was to take the stocks with a lower Price/Book Value that would be the value stocks while the others would be the growth.  The principle is that some of the beaten-down stocks will appreciate more than the growth stocks will.  6 Ways To Improve Your Portfolio Returns Today also makes note of the "growth vs value" split if you want another reference that way.  Historically, growth has been more volatile and produced lower returns, though past performance isn't necessarily always going to hold as some people like to invest in what is known as a "slice & dice" portfolio where a portion in invested in each of 4 corners: Large-growth, large-value, small-growth, and small-value.  Some may add in bonds, REITs, and foreign stocks but the idea is that in different years, different parts of the market will do better and this is a way to capture that in a sense.