@misc{Gebus_Beata_Isotopis,
 author={Gebus, Beata and Hałas, Stanisław},
 howpublished={online},
 publisher={Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={artykuł},
 title={Isotopis studies of nitrates - a short review},
 keywords={nitrogen, nitrate, isotopic analysis, δ15N value, δ15O value},
}