@book { Elastizitt,
    title = "Elastizität",
    author = "Jennifer {Ham}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/978-1-4539-0982-9",
    url = "https://www.peterlang.com/document/1054380"
}