@book{ BC16424751,
 author = "Ptak, Roderich",
 title = "China und Asiens maritime Achse im Mittelalter : Konzepte, Wahrnehmungen, offene Fragen",
 publisher = "De Gruyter",
 year = "2019",
 series = "Das mittelalterliche Jahrtausend",
 number = "Bd. 5",
 URL = "https://ci.nii.ac.jp/ncid/BC16424751"
}
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