@misc{Goworek_Tomasz_Positronium,
 author={Goworek, Tomasz},
 howpublished={online},
 publisher={Wydaw. UMCS},
 language={eng},
 title={Positronium as a probe of small free volumes in crystals, polymers and porous media},
 type={artykuł},
 keywords={positronium, crystals media, polymers media, porous media, positron spectroscopy},
}