@misc{Polski_Rejestr_Statków_Rules,
 author={Polski Rejestr Statków},
 howpublished={online},
 publisher={Polski Rejestr Statków},
 language={eng},
 type={e-książka},
 title={Rules for statutory survey of sea-going ships. Pt. 9, Environmental protection : July 2021},
 keywords={kontrola techniczna, ochrona środowiska},
}