@book { OnImprovisation,
    title = "On Improvisation",
    subtitle = "Nine Conversations with Roberto Ciulli",
    author = "Malgorzata {Bartula} and Stefan {Schroer}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    url = "https://www.peterlang.com/document/1094968"
}