Orkwiszewska, A. and Gładykowska-Rzeczycka, J. 1994. The Frequency of Birth and Morphology of Premature Newborn in the Gdansk District. Anthropological Review. 57, 1-2 (Dec. 1994), 33–37. DOI:https://doi.org/10.18778/1898-6773.57.1-2.04.