@book { TheNewPensionMixinEurope,
    title = "The New Pension Mix in Europe",
    author = "David {Natali}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/b10956",
    url = "https://www.peterlang.com/document/1113268"
}