@book { AveMarisStella,
    title = "«Ave Maris Stella»",
    author = "Klaus-Dieter {Ertler} and Andrea Maria {Humpl} and Daniela {Maly}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099292"
}