@Book{OL19397526M,
    title: {\textquotedbl{}Mahagonny\textquotedbl{}},
    author: {Bertolt Brecht},
    publisher: {Suhrkamp},
    year: {2006},
    place: {Frankfurt am Main},
}

@Book{OL370564M,
    title: {Love in a dead language},
    author: {Lee Siegel},
    publisher: {University of Chicago Press},
    year: {1999},
    place: {Chicago},
}

@Work{OL10722454W,
    title: {Si-yu-ki},
    author: {Xuanzang},
    first_publish_year: {1884}
}

@Work{OL12900495W,
    title: {A Journal of the first voyage of Vasco Da Gama, 1497-1499},
    author: {Vasco da Gama},
    first_publish_year: {1998}
}

@Author{OL5834439A,
    name: {Vasco da Gama},
    birth_date: {1469}
    , death_date: {1524}
}