@book { FrequenzstabilisierungeinesHENELasers,
    title = "Frequenzstabilisierung eines HE-NE Lasers",
    author = "Hanspeter {Brändli}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069371"
}