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[4] McKinsey & Company, 2020. Die nächste Normalität im Bauwesen. [online] p.50. Verfügbar unter: www.mckinsey.com/~/media/McKinsey/Industries/Capital%20Projects%20and%20Infrastructure/Our%20Insights/The%20next%20normal%20in%20construction/The-next-normal-in-construction.pdf