• Richard N. Shiffman, George Michel, Michael Krauthammer, Norbert E. Fuchs, Kaarel Kaljurand, and Tobias Kuhn. Writing Clinical Practice Guidelines in Controlled Natural Language. in: N.E. Fuchs (ed.), Workshop on Controlled Natural Languages, CNL 2009, LNCS/LNAI 5972, Springer, pp. 265-280, 2010.
• Tamseela Hussain, George Michel, Richard N. Shiffman: The Yale Guideline Recommendation Corpus: A Representative Sample of the Knowledge Content of Guidelines, International Journal of Medical Informatics, Volume 78, Issue 5, Pages 354-363 .
• Tamseela Hussain, George Michel, Richard N. Shiffman: How Often is Strength of Recommendation Indicated in Guidelines? Analysis of the Yale Guideline Recommendation Corpus , Proc AMIA Symp 2008 Nov 6:984.