@article {Angelov1989, title = {Parallele in den sozial-{\"o}konomischen Verh{\"a}ltnissen der mittelalterlichen balkanischen Staaten}, journal = {Palaeobulgarica / Старобългаристика}, volume = {13}, year = {1989}, pages = {3{\textendash}13}, author = {Angelov, Dimit{\^a}r} }