@book { AusdauertrainingTrainingsplanungmittelsWHOTest,
    title = "Ausdauertraining: Trainingsplanung mittels WHO-Test",
    author = "Vivien {Kaiser}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656420668",
    url = "https://www.hausarbeiten.de/document/212805"
}