@misc{Polski_Rejestr_Statków_Rules,
 author={Polski Rejestr Statków},
 howpublished={online},
 publisher={Polski Rejestr Statków},
 language={eng},
 title={Rules for the classification and construction of sea-going ships. Pt. 9, Materials and welding, 2015 July},
 type={e-książka},
 keywords={wpisanie do rejestru, budownictwo okrętowe, normy, materiały, spawanie},
}