Hennig, G. J.; Herr, W.; Weber, E.; Xirotiris, N. I. (6 August 1981). "ESR-dating of the fossil hominid cranium from Petralona Cave, Greece". Nature. 292 (5823): 533–536. Bibcode:1981Natur.292..533H. doi:10.1038/292533a0. S2CID4359695.
Runnels, Curtis; van Andel, Tjeerd H. (January 1993). "The Lower and Middle Paleolithic of Thessaly, Greece". Journal of Field Archaeology. 20 (3): 299–317. doi:10.1179/jfa.1993.20.3.299.
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Hennig, G. J.; Herr, W.; Weber, E.; Xirotiris, N. I. (6 August 1981). "ESR-dating of the fossil hominid cranium from Petralona Cave, Greece". Nature. 292 (5823): 533–536. Bibcode:1981Natur.292..533H. doi:10.1038/292533a0. S2CID4359695.
Hennig, G. J.; Herr, W.; Weber, E.; Xirotiris, N. I. (6 August 1981). "ESR-dating of the fossil hominid cranium from Petralona Cave, Greece". Nature. 292 (5823): 533–536. Bibcode:1981Natur.292..533H. doi:10.1038/292533a0. S2CID4359695.