Letter dated 17 February 1987 from the Permanent Representative of Costa Rica to the United Nations addressed to the Secretary-General.
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English:A_42_130_S_18697-EN - PDF ; Español:A_42_130_S_18697-ES - PDF ; Français:A_42_130_S_18697-FR - PDF ; Русский:A_42_130_S_18697-RU - PDF ; العربية:A_42_130_S_18697-AR - PDF ; 中文:A_42_130_S_18697-ZH - PDF ;
"Annex: Proposal put forward by the President of Costa Rica at the meeting with the Presidents of El Salvador, Guatemala and Honduras held at San José on 15 February 1987": p. 2-7.