Gray, Wesley R. (drexel University's Lebow College Of Business; University Of Chicago Booth School Of Business; The Wharton School, Vogel, Jack R. (drexel University's Lebow College Of Business; University Of Scranton) (2) Schlüter, Volkert, Deussen, Ralf (1) Riehl, Hans Jürgen (1) Butzbach, Friedrich (1) Vogel, Hetty De (1)