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Sweden
Practice Relating to Rule 46. Orders or Threats That No Quarter Will Be Given
Sweden’s IHL Manual (1991) considers that the prohibition on ordering that no quarter shall be granted as contained in Article 40 of the 1977 Additional Protocol I is part of customary international law. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 2.2.3, p. 19.