@book { ThroughtheBackDoor,
    title = "Through the Back Door",
    author = "Jerzy {Kochanowski}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04801-8",
    url = "https://www.peterlang.com/document/1048831"
}