Omer Sergi just published a very nice article in Tel Aviv on the expansion of the Kingdom of Judah in the 9th cent. BCE. As he particularly stresses the role of Gath in stopping this expansion until Gath is destroyed by Hazael – and the importance of the Kingdom of Gath until this point, I’m particularly fond of the article!
Here are the details:
Sergi, O. 2013 Judah’s Expansion in Historical Context. Tel Aviv 40: 226–46.