Languages of the European Union languages, Latvian and Lithuanian; the Celtic languages, including Irish; and Greek are also Indo-European. Outside the Indo-European family, Estonian, Finnish, and Hungarian are Uralic languages while Maltese is the only Afroasiatic language with official status in the EU. The Basque language, a language isolate whose roots are unknown, is an official language in some parts of northern Spain, but not an official language of the EU. Most official EU languages are written in the Latin script. The two exceptions are Greek, which is written in the Greek script, and Bulgarian, which is written in Cyrillic script. With the accession of
Uralic–Yukaghir languages his 1931 book "Linguistic Science in the Nineteenth Century" (p. 338). Pedersen included both languages in his proposed Nostratic language family (ib.). A genetic relationship between Uralic and Yukaghir was argued for in "Jukagirisch und Uralisch" ('Yukaghir and Uralic'), a 1940 work by Björn Collinder, one of the leading Uralic specialists of the 20th century (Greenberg 2005:124). Collinder was inspired by a 1907 article by Heikki Paasonen, which pointed to similarities between Uralic and Yukaghir, though it did not identify the two languages as genetically related (Greenberg, ib.). Uralic–Yukaghir is listed as a language family in "A Guide to the