The System of Spatial Cases in Middle Mongolian Dialects and
Its Development in the Modern Mongolian Languages
(45th Meeting of the PIAC, Budapest 2002)
On the basis of isoglosses in the system of spatial cases the Middle Mongolian monuments may be divided into 2 base dialects (Western and Eastern). I argue, that the only survived descendant of the Medieval Eastern Dialect is the Written Mongolian language while other modern Mongolian languages originated from the Western dialect.