@book { LifelongLearningOneFocusDifferentSystems,
    title = "Lifelong Learning: One Focus, Different Systems",
    author = "Klaus {Harney} and Anja {Heikkinen} and Sylvia {Rahn} and Michael {Schemmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093136"
}