@book { MeanRiskEffizienzversusStochastischeEffizienz,
    title = "Mean Risk-Effizienz versus Stochastische Effizienz",
    author = "Jürgen {Marx}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096383"
}