Chakavian
Chakavian in its actual use is the least spoken Serbo-Croatian dialect, being spoken only by 12% Croats. It is now mostly reduced in southwestern Croatia along the eastern Adriatic: Adriatic islands, and sporadically in the mainland coast, with rare inland enclaves up to central Croatia, and minor enclaves in Austria and Montenegro. All areas of old contacts with Romance languages.
Snježana Kordić
With a plethora of quotations from German, French, Polish and English linguistic literature, Kordić demonstrates that the language of Croats, Serbs, Bosniaks and Montenegrins is a polycentric language, with four standard variants spoken in Croatia, Serbia, Montenegro and Bosnia and Herzegovina.