@book { IndexTheoryandPriceStatistics,
    title = "Index Theory and Price Statistics",
    author = "Peter {von der Lippe}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01120-3",
    url = "https://www.peterlang.com/document/1053636"
}