Trawling the vast ocean of academic literature in search of recent articles on the Third Punic War can be an extremely frustrating (and, more often than not, fruitless) activity. Still, I did manage to unearth this little gem of a study from the JSTOR archive:

Baronowski, Donald Walter. 1995. 'Polybius on the Causes of the Third Punic War'. Classical Philology 90, no. 1: 16-31.

The author attempts to reconstruct Polybius' lost analysis of the causes of Rome's final showdown with Carthage. Here is an excerpt from the first part of this article:

From Polybius' account of the Third Punic War only exiguous fragments survive of Books 36 and 38. The casualties include his study of causes . . . Although traces of his judgment subsist, to the best of my knowledge there exists no full systematic reconstruction of Polybius' formal analysis of causes. An examination of this problem will help to clarify not only his thinking about the Third Punic War but also his general attitude towards Roman imperialism.

I'll post some comments on the article soon, after I've had the chance to review it thoroughly.