Schlechtriem, Peter, Good Faith in German Law and in International Uniform Laws, Rome 1997

Principles and rules commanding the observance of good faith and fair dealing in relationships governed by the law of obligations, in particular those created by contract, are common stock of most legal systems to which I have access.

[Subsequently set out in detail with an analysis of the functions and values fo the concept.]

Referring Principles
Trans-Lex Principle: I.1.1 - Good faith and fair dealing in international trade
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