BACKHAUS, Richard

2004. The Limits of the Duty to Perform in the Principles of European Contract Law, 8.1 Electronic Journal of Comparative Law (March 2004) <http://www.ejcl.org/81/abs81-2.html> [Analysis of PECL Arts. 8:108 "Excuse Due to an Impediment" and 6:111 "Change of Circumstances"]