@book { PreparationProcessesofNonfinancialKPIsforManagementReports, title = "Preparation Processes of Nonfinancial KPIs for Management Reports", author = "Matthias {Nienaber}", year = "2019", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/b16237", url = "https://www.peterlang.com/document/1058640" }