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Achtenhagen, L., Picard, R.G. Der Portfolio-Ansatz in den Medienindustrien – Ein strategisches Werkzeug mit unterschätztem Wert?. Z Control Manag 49 (Suppl 8), 42–48 (2005). https://doi.org/10.1365/s12176-005-0472-0
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DOI: https://doi.org/10.1365/s12176-005-0472-0