Deviant burials and social identity in a postmedieval Polish cemetery: An analysis of stable oxygen and carbon isotopes from the "vampires" of Drawsko.
Lesley A GregorickaAmy B ScottTracy K BetsingerMarek PolcynPublished in: American journal of physical anthropology (2017)
Those interred as vampires appear local to the region and thus likely underwent deviant funerary treatment due to some other social stigma not apparent from the skeleton.