@misc{Bondecka-Krzykowska_Izabela_The,
 author={Bondecka-Krzykowska, Izabela},
 howpublished={online},
 publisher={Wydaw. Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={artykuł},
 title={The four-color theorem and its consequences for the philosophy of mathematics},
}