A/RES/63/149 particular the non-discriminatory treatment and protection of refugee women and refugee children and minority groups of refugees; 9. Affirms that children, because of their age, social status and physical and mental development, are often more vulnerable than adults in situations of forced displacement, recognizes that forced displacement, return to post-conflict situations, integration in new societies, protracted situations of displacement and statelessness can increase child-protection risks, taking into account the particular vulnerability of refugee children to forcible exposure to the risks of physical and psychological injury, exploitation and death in connection with armed conflict, and acknowledges that wider environmental factors and individual risk factors, particularly when combined, may generate different protection needs; 10. Recognizes that no solution to displacement can be durable unless it is sustainable, and therefore encourages the Office of the High Commissioner to support the sustainability of return and reintegration; 11. Also recognizes the importance of early registration and effective registration systems and censuses as a tool of protection and as a means to the quantification and assessment of needs for the provision and distribution of humanitarian assistance and to implement appropriate durable solutions; 12. Recalls the conclusion on registration of refugees and asylum-seekers adopted by the Executive Committee at its fifty-second session, 10 notes the many forms of harassment faced by refugees and asylum-seekers who remain without any form of documentation attesting to their status, recalls the responsibility of States to register refugees on their territories and, as appropriate, the responsibility of the Office of the High Commissioner or mandated international bodies to do so, reiterates in this context the central role that early and effective registration and documentation can play, guided by protection considerations, in enhancing protection and supporting efforts to find durable solutions, and calls upon the Office, as appropriate, to help States to conduct this procedure should they be unable to register refugees on their territory; 9F 13. Calls upon the international community, including States and the Office of the High Commissioner and other relevant United Nations organizations, within their respective mandates, to take concrete action to meet the protection and assistance needs of refugees, returnees and displaced persons and to contribute generously to projects and programmes aimed at alleviating their plight and facilitating durable solutions for refugees and displaced persons; 14. Reaffirms the importance of timely and adequate assistance and protection for refugees, returnees and displaced persons, also reaffirms that assistance and protection are mutually reinforcing and that inadequate material assistance and food shortages undermine protection, notes the importance of a rights- and communitybased approach in engaging constructively with individual refugees, returnees and displaced persons and their communities so as to achieve fair and equitable access to food and other forms of material assistance, and expresses concern in regard to situations in which minimum standards of assistance are not met, including those in which adequate needs assessments have yet to be undertaken; 15. Also reaffirms that respect by States for their protection responsibilities towards refugees is strengthened by international solidarity involving all members _______________ 10 Ibid., Fifty-sixth Session, Supplement No. 12A (A/56/12/Add.1), chap. III, sect. B. 3