Yonatan Adler, “Ritual Baths Adjacent to Tombs: An Analysis of the Archaeological Evidence in Light of the Halakhic Sources,” Journal for the Study of Judaism 40 (2009), pp. 55–73. This, of course, excludes the Pool of Siloam discovered in 2004 near the southern end of the City of David, since the original purpose of the stepped pool is still debated.