@book { DieukrainischeSprache,
    title = "Die ukrainische Sprache- Украинский язьιк",
    author = "Tat'jana Petrovna {Troskina}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091635"
}