@book { ToWhatDegreeDoesITInfluenceCompetitiveAdvantage,
    title = "To What Degree Does IT Influence Competitive Advantage?",
    author = "Andreas {Keller}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656004592",
    url = "https://www.hausarbeiten.de/document/178444"
}