The International Commission for the Protection of the Danube River (ICPDR), an organisation established by the Danube River Protection Convention, was signed by the Danube countries in Sofia, Bulgaria.[5]
^Roszkowski, Wojciech; Kofman, Jan (2015). Biographical Dictionary of Central and Eastern Europe in the Twentieth Century. London: Routledge. p. 267. ISBN978-1-31747-594-1.