7 List of Abbreviations 1954 Convention 1954 Convention Relating to the Status of Stateless Persons 1961 Convention 1961 Convention on the Reduction of Statelessness SDP Statelessness determination procedure UNHCR United Nations High Commissioner for Refugees ENS European Network on Statelessness EU European Union OSCE Organization for Security and Co-operation in Europe UN United Nations NGO(s) Non-governmental organisation(s)