@book { DiscretionaryPowerofPublicAdministration,
    title = "Discretionary Power of Public Administration",
    author = "Leszek {Leszczyński} and Adam {Szot}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11220",
    url = "https://www.peterlang.com/document/1055648"
}