@book { WasmachteeinenHiddenChampionzueinemHiddenChampion,
    title = "Was machte einen Hidden Champion zu  einem Hidden Champion?",
    author = "Jürgen {Weimann}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656489092",
    url = "https://www.hausarbeiten.de/document/232484"
}