From SSRN:
Yossi Nehushtan, Conscientious Exemptions: How They Should Be Granted and By Whom, (April 2007).
Michael A. Helfand, When Religious Practices Become Legal Obligations: Extending the Foreign Compulsion Defense, (Journal of Law and Religion, Vol. 23, 2008).
From SmartCILP:
Book review colloquy on Religious Freedom and the Constitution, by Christopher L. Eisgruber and Lawrence G. Sager. Articles by Thomas C. Berg, Kent Greenawalt, Ira C. Lupu and Robert W. Tuttle; response by Christopher L. Eisgruber and Lawrence G. Sager, 85 Texas Law Review 1185-1287 (2007).