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Raymond Schwartz (1894-1973)(Tonkin 1977) ; (Tonkin et Fettes 1996 : 122‑145) ; (Soros 2001 : 144‑156)BibliografioSoros T. - Masquerade: dancing around death in Nazi-occupied Hungary, Arcade Pub., New York, 2001Tonkin H. - Esperanto and international language problems: a research bibliography, Esperantic Studies Foundation, Washington, 1977Tonkin H. et Fettes M. - Esperanto studies: an overview, Universala Esperanto-Asocio, Rotterdam, Netherlands, 1996.&#160;