@misc{Leciejewicz_Lech_(1931–2011)_Sea_1971,
 author={Leciejewicz, Lech (1931–2011)},
 volume={23},
 editor={Heaton-Potworowska, D. Tr.},
 editor={Institute of History of the Polish Academy of Sciences},
 copyright={Rights Reserved - Restricted Access},
 address={Wrocław},
 journal={Acta Poloniae Historica},
 howpublished={online},
 year={1971},
 publisher={Zakład Narodowy im. Ossolińskich},
 language={eng},
 type={Text},
 title={Sea Problems in Research into Early Medieval Poland},
 keywords={historiography - Poland - Middle Ages, Poland, Pomerania, Early Middle Ages, Baltic Sea, Western Slavs, trade, sea battles},
}