Bulgarians aren't ethnic Slavic ffs
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0135820"In contrast to this apparent genetic homogeneity of the majority of West and East Slavs, the gene pool of South Slavs, who are confined to the geographically smaller Balkan Peninsula, differs substantially and shows internal differentiation, as testified by their NRY and autosomal variation"
