@book { PeaceSupportOperationsLessonsLearnedandFuturePerspectives,
    title = "Peace Support Operations: Lessons Learned and Future Perspectives",
    author = "Kurt R. {Spillmann} and Thomas {Bernauer} and Jürg Matin {Gabriel} and Andreas {Wenger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1092990"
}