@misc{Sułowska_Agnieszka_Double-digit,
 author={Sułowska, Agnieszka and Karpiński, Marcin},
 howpublished={online},
 publisher={Educational Research Institute},
 language={eng},
 type={article},
 title={Double-digit coding of examination math problems},
 keywords={evaluation, double-digit coding, final exam, PISA, TIMSS},
}