@misc{Michalski_Andrzej_Sufficient,
 author={Michalski, Andrzej},
 howpublished={online},
 publisher={nakł. UMCS},
 language={eng},
 type={artykuł},
 title={Sufficient conditions for quasiconformality of harmonic mappings of the upper halfplane onto itself},
 keywords={matematyka},
}