Here som useful links but first an important map in two editions – of the ethnic composition of Yugoslavia from the official census of 1981.
If more governments, politicians, diplomats and media people had known this map and not just the geographic map, things might have been different today:
– enlarge by clicking and then double-click to get details of the map
– click to enlarge
– click to enlarge
These sources are not necessarily endorsed by the authors but contain useful materials and overviews.
Wikipedia – Socialist Federal Republic of Yugoslavia (SFRY)
Wikipedia – Yugoslavia and its dissolution
Yugoslavia - What Should Have Been Done? 
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