@book { Allgemeinekologie,
    title = "Allgemeine Ökologie",
    subtitle = "Band 1- Organismus und Umwelt",
    author = "Ludwig {Trepl}",
    year = "2005",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099337"
}