Links
[1] https://peacekeeping.un.org/en/70-years-when-trygve-lie-became-first-un-secretary-general
[2] https://minurso.unmissions.org/70-years-when-trygve-lie-became-first-un-secretary-general
[3] https://peacekeeping.un.org/en/news-our-missions
[4] https://peacekeeping.un.org/en/minurso-news