@misc{Seraphim_Peter-Heinz_Changes,
 author={Seraphim, Peter-Heinz},
 howpublished={online},
 publisher={The Baltic Institute},
 language={eng},
 type={dokument piśmienniczy},
 title={Changes in the structure of Baltic trade},
 keywords={porty, transport morski, Morze Bałtyckie},
}