The following blurb comes from the SEA site,
We do not always announce in the blog the addition of specific articles to the site’s article database. (We regularly add articles to the site, and upon being added they appear in the “Recent Articles” box on the right side of our home page. After an article is pushed off the recent articles list by newer articles, it can only be found through the topical index or through the site’s search function.) But we wanted to draw your attention to a particularly excellent article that we are adding today by Robert Chisholm Jr. on hardening in the Old Testament. I think it includes the best overall single treatment of the hardening of Pharaoh’s heart available, though it covers more than just the case of Pharaoh. We want to thank the journal that published the article, Bibliotheca Sacra, for granting us permission to make the article available, as well as a few other articles that have appeared in the journal and are relevant to the Arminian/Calvinist debate.
You can find Chisholm’s article on hardening here.