@misc{Lapinska-Chrzczonowicz_Magdalena_Exact,
 author={Lapinska-Chrzczonowicz, Magdalena and Matus, Piotr},
 howpublished={online},
 publisher={Wydaw. Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={czasopismo},
 title={Exact difference schemes and schemes of higher order of approximation for convection-diffusion equation. I},
}