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                    Frey,D.D., Herder,P.M., Wijnia,Y., Subrahmanian,E., Katsikopoulos,K.V., & Clausing,D.P. (2007)
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                    An evaluation of the pugh controlled convergence method
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                    Frey,D.D., Herder,P.M., Wijnia,Y., Subrahmanian,E., Katsikopoulos,K.V., & Clausing,D.P. (2009)
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                    The pugh controlled convergence method: Model-based evaluation and implications for design theory
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                    Frey,D.D., Herder,P.M., Wijnia,Y., Subrahmanian,E., Katsikopoulos,K.V., Neufville,R.d., Oye,K., & Clausing,D.P. (2010)
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                    Research in engineering design: The role of mathematical theory and empirical evidence
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