@book { EHSwirdEMS,
    title = "EHS wird EMS",
    author = "Christian {Erlitz}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656210467",
    url = "https://www.hausarbeiten.de/document/195227"
}