@book { ProblemSolvingwithQuantitativeMethodsDecisionMaking,
    title = "Problem Solving with Quantitative Methods / Decision Making",
    author = "Boris {Sosnizkij}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638286138",
    url = "https://www.hausarbeiten.de/document/26200"
}