@book { IndirectandDirectAggression,
    title = "Indirect and Direct Aggression",
    author = "Karin {Österman}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00716-9",
    url = "https://www.peterlang.com/document/1044201"
}