In addition to the Charter of the UN, consider important subsequent documents, such as
UNGA ‘An Agenda for Peace: Preventive Diplomacy, Peacemaking and Peace-Keeping: Report of the Secretary-General pursuant to the Statement Adopted by the Summit Meeting of the Security Council on 31 January 1992’ (17 June 1992) UN Doc A/47/277–S/2411 2411 (‘Agenda’).
UNGA ‘Supplement to an Agenda for Peace: Position Paper of the Secretary-General on the Occasion of the fiftieth Anniversary of the United Nations’ (25 January 1995) UN Doc A/50/60-S/1995/1 (‘Supplement’).
For further help with the UN and its documents and publications, please consult the guide below:
Subject searches to try in SOLO include
United Nations -- Peacekeeping forces
Peacekeeping and multinational operations
Intervention (International law)
Conflict management -- International cooperation
To find more dommentary on SOLO try the general subject searches below:
The name of a specific treaty may also be worth trying.
A quick route to the actual provisions within peace treaties, try the online tool below: