Dialects of Serbo-Croatian
Kajkavian is spoken in North Croatia, including the capital Zagreb, as well as in a few enclaves in Austria, Hungary, and Romania. Though its speakers are ethnic Croats and Kajkavian is thus generally considered a dialect of Serbo-Croatian, it is closer to neighboring Slovene than it is to Chakavian or Shtokavian. The Kajkavian area of Croatia is bordered on the northwest by Slovene language territory. It is bordered on the east and southeast by Shtokavian dialects roughly along a line that was the former division between Civil Croatia and the Habsburg Military Frontier; in southwest along Kupa and Dobra rivers, it persisted in ancient (medieval) contact with Chakavian dialects.
Dalibor Brozović
Instead of "Serbo-Croatian", Brozović preferred the term "Central South Slavic diasystem", asserting separate language status for Croatian and Serbian. However, Brozović advocated the term "Croato-Serbian" even in 1988. As far as language status is concerned, Brozović has asserted for nearly three decades that "the Serbian and Croatian variants are (...) phenomenons, which are analogous to the English and American variants"; "As in other cases where several nations use one standard language (German, Dutch, English, French, Spanish, Portuguese standard language), the standard Croato-Serbian language is not unified. In linguistics (especially in sociolinguistics), the realizations of such standard languages are called "variants of a standard language"". Brozović maintained that it is "a fact that Serbs and Croats have a common language", and he described it as pluricentric even in 1992. In the 1990s, Brozović became one of the leading proponents of linguistic purism in Croatia.