@book { PerspektivePensionopolis, title = "Perspektive Pensionopolis!", author = "Erika {Steinert} and Norbert {Zillich}", year = "2012", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-01428-0", url = "https://www.peterlang.com/document/1053618" }