@book { CurrentEconomicSituationofPortugal,
    title = "Current Economic Situation of Portugal",
    author = "Andreas {Haug}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656167877",
    url = "https://www.hausarbeiten.de/document/191265"
}