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Quality function deployment and six sigma : a QFD handbook
Ficalora, Joseph P., (2010)
Kundenorientierte Produktgestaltung
Hertel, Günter, (2000)
The customer-driven company : managerial perspectives on QFD
Eureka, William E., (1988)
The differentiation ratio in corporate image research
Cohen, Louis, (1967)
Training psychologists
Cohen, Louis, (1969)