The prince Nicolaï Sergueïevitch Troubetzkoy (in Russian НиколайСергеевичТрубецкой), born the 4 (16) April 1890 with Moscow and deceased on June 25th, 1938 with Vienna (Austria), was a Russian Linguiste , having belonged to the linguistic Cercle of Prague. He founded the Morphophonologie with Roman Jakobson and Serge Karcevski.

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