@Book{OL37873566M,
    title: {Einführung in Python},
    author: {Mark Lutz and David Ascher},
    publisher: {O'Reilly},
    year: {2000},
    place: {Beijing},
}

@Author{OL411267A,
    name: {Mark Lutz},
}
@Author{OL2726848A,
    name: {David Ascher},
}