@book { EliminatingEmptyCategories,
    title = "Eliminating Empty Categories",
    author = "Diego Gabriel {Krivochen} and Peter {Kosta}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02592-7",
    url = "https://www.peterlang.com/document/1046372"
}