A/RES/51/12 Page 5 18. Invites voluntary contributions to the combined Forces in cash and in the form of services and supplies acceptable to the Secretary-General, to be administered, as appropriate, in accordance with the procedure established by the General Assembly in its resolutions 43/230 of 21 December 1988, 44/192 A of 21 December 1989 and 45/258 of 3 May 1991; 19. Decides to keep under review during its fifty-first session the agenda item entitled "Financing of the United Nations Protection Force, the United Nations Confidence Restoration Operation in Croatia, the United Nations Preventive Deployment Force and the United Nations Peace Forces headquarters". 50th plenary meeting 4 November 1996