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A. R. Keiler (1972) A reader in historical and comparative linguistics, New York, Rinehart and Winston.
Structuralism
Typological studies and their contribution to historical comparative linguistics
Roman Jakobson
pp. 299-305
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(1958) "Typological studies and their contribution to historical comparative linguistics", in: Sivertsen Eva, Proceedings of the 8th International Congress of Linguists, Oslo, Oslo University Press, pp.17-25.