The court discusses the conditions under which a party may be estopped from raising a ground for refusal of enforcement under the Convention or has waived the right to raise it.
Estoppel/waiver
503
The court discusses the burden of proof of the grounds for refusing enforcement under the Convention.
Burden of proof on respondent
511
Due process: The court discusses various irregularities affecting due process, including letters not sent, names of arbitrators or experts not communicated, language of proceedings and communications, etc.
"Otherwise unable to present his case"
513
Ground d: Irregularity in the composition of the arbitral tribunal or arbitral procedure
518
Public policy: The court discusses the meaning of (international as compared to domestic) public policy, generally defined as the basic notions of morality and justice of the enforcement State.
Paragraph 2 - Distinction domestic-international public policy