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For case citations, texts and other lex mercatoria material on venire contra factum proprium:

1. Go to the CENTRAL Transnational Law Database (TLDB).

   http://tldb.uni-koeln.de/TLDB.html

   Click TLDB's "List of Lex Mercatoria Principles".

2. Scroll to Chapter I: General Provisions, Principle No. I.7 - Venire contra factum proprium.

   "No one may set himself in contradiction to his own previous conduct ('non concedit venire contra factum proprium'; 'l'interdiction de se contredire au detriment d'autrui')."

   The TLDB database provides annotations to this text. The TLDB annotations address Doctrine, Awards, Court Decisions, Conventions.